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Africa
the second largest continent; located to the south of Europe and bordered to the west by the South Atlantic and to the east by the Indian Ocean
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agriculture
the practice of cultivating the land or raising stock
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airport
an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo
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Alaska
a state in northwestern North America; the 49th state admitted to the union
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America
North America and South America and Central America
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Antarctic Circle
a line of latitude north of the south pole
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Appalachian Mountains
a mountain range in the eastern United States extending from Quebec to the Gulf of Mexico; a historic barrier to early westward expansion of the United States
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area
the extent of a 2-dimensional surface enclosed within a boundary
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Arizona
a state in southwestern United States; site of the Grand Canyon
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Asia
the largest continent with 60% of the earth's population; it is joined to Europe on the west to form Eurasia; it is the site of some of the world's earliest civilizations
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atmosphere
the envelope of gases surrounding any celestial body
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barrier
a structure or object that impedes free movement
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body of water
the part of the earth's surface covered with water (such as a river or lake or ocean)
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boundary
the line or plane indicating the limit or extent of something
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California
a state in the western United States on the Pacific; the 3rd largest state; known for earthquakes
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Canada
a nation in northern North America; the French were the first Europeans to settle in mainland Canada
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capital
one of the large alphabetic characters used as the first letter in writing or printing proper names and sometimes for emphasis
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chart
a visual display of information
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city
a large and densely populated urban area; may include several independent administrative districts
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city center
the central part of a city
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climate
the weather in some location averaged over some long period of time
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climate change
a change in the world's climate
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coast
the shore of a sea or ocean
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community
a group of people living in a particular local area
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construction
the act of constructing something
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continent
one of the large landmasses of the earth
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country
the territory occupied by a nation
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county
(United States) the largest administrative district within a state
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creek
a natural stream of water smaller than a river (and often a tributary of a river)
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crop
a cultivated plant that is grown commercially on a large scale
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crop failure
the failure of crops to produce a marketable surplus
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culture
all the knowledge and values shared by a society
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custom
accepted or habitual practice
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dam
a barrier constructed to contain the flow of water or to keep out the sea
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desert
leave someone who needs or counts on you; leave in the lurch
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direction
a line leading to a place or point
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discovery
the act of discovering something
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distance
the property created by the space between two objects or points
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Dominican Republic
a republic in the West Indies; located on the eastern two-thirds of the island of Hispaniola
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downtown
the central area or commercial center of a town or city
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downwind
towards the side away from the wind
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drought
a shortage of rainfall
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earthquake
shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity
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East Coast
the eastern seaboard of the United States (especially the strip between Boston and Washington D.C.)
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elevation
distance of something above a reference point (such as sea level)
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England
a division of the United Kingdom
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environment
the totality of surrounding conditions
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equator
an imaginary line around the Earth forming the great circle that is equidistant from the north and south poles
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erosion
(geology) the mechanical process of wearing or grinding something down (as by particles washing over it)
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Europe
the 2nd smallest continent (actually a vast peninsula of Eurasia); the British use `Europe' to refer to all of the continent except the British Isles
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expansion
the act of increasing (something) in size or volume or quantity or scope
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exploration
to travel for the purpose of discovery
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famine
a severe shortage of food (as through crop failure) resulting in violent hunger and starvation and death
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farming
the practice of cultivating the land or raising stock
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farmland
a rural area where farming is practiced
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flash flood
a sudden local flood of great volume and short duration
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flood
the rising of a body of water and its overflowing onto normally dry land
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food chain
(ecology) a community of organisms where each member is eaten in turn by another member
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food web
(ecology) a community of organisms where there are several interrelated food chains
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forest
the trees and other plants in a large densely wooded area
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forest fire
an uncontrolled fire in a wooded area
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forestry
the science of planting and caring for forests and the management of growing timber
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fossil fuel
fuel consisting of the remains of organisms preserved in rocks in the earth's crust with high carbon and hydrogen content
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France
a republic in western Europe; the largest country wholly in Europe
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fuel
a substance that can be consumed to produce energy
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ghost town
a deserted settlement (especially in western United States)
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globe
an object with a spherical shape
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graph
a visual representation of the relations between certain quantities plotted with reference to a set of axes
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grassland
land where grass or grasslike vegetation grows and is the dominant form of plant life
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harbor
a sheltered port where ships can take on or discharge cargo
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highway
a major road for any form of motor transport
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hill
a local and well-defined elevation of the land
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home
where you live at a particular time
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hospital
a medical institution where sick or injured people are given medical or surgical care
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hotel
a building where travelers can pay for lodging and meals and other services
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housing
structures collectively in which people are housed
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Indian Ocean
the 3rd largest ocean; bounded by Africa on the west, Asia on the north, Australia on the east and merging with the Antarctic Ocean to the south
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International Date Line
an imaginary line on the surface of the earth following (approximately) the 180th meridian
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irrigation
supplying dry land with water by means of ditches etc
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Japan
a constitutional monarchy occupying the Japanese Archipelago; a world leader in electronics and automobile manufacture and ship building
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kilometer
a metric unit of length equal to 1000 meters (or 0.621371 miles)
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lake
a body of (usually fresh) water surrounded by land
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land
the solid part of the earth's surface
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landmark
the position of a prominent or well-known object in a particular landscape
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landscape
an expanse of scenery that can be seen in a single view
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latitude
an imaginary line around the Earth parallel to the equator
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legend
a story about mythical or supernatural beings or events
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life cycle
a series of stages through which an organism passes between recurrences of a primary stage
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life expectancy
an expected time to live as calculated on the basis of statistical probabilities
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lifestyle
a manner of living that reflects the person's values and attitudes
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location
the act of putting something in a certain place
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logging
the work of cutting down trees for timber
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longitude
the angular distance between a point on any meridian and the prime meridian at Greenwich
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Louisiana
a state in southern United States on the Gulf of Mexico; one of the Confederate states during the American Civil War
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manufacturing plant
a plant consisting of one or more buildings with facilities for manufacturing
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map projection
a projection of the globe onto a flat map using a grid of lines of latitude and longitude
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marketplace
an area in a town where a public mercantile establishment is set up
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Mexico
a republic in southern North America; became independent from Spain in 1810
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mile
a unit of length equal to 1,760 yards or 5,280 feet; exactly 1609.344 meters
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mining
the act of extracting ores or coal etc from the earth
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Mississippi River
a major North American river and the chief river of the United States; rises in northern Minnesota and flows southward into the Gulf of Mexico
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monsoon
a seasonal wind in southern Asia; blows from the southwest (bringing rain) in summer and from the northeast in winter
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mountain
a land mass that projects well above its surroundings; higher than a hill
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mountain pass
the location in a range of mountains of a geological formation that is lower than the surrounding peaks
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mountain range
a series of hills or mountains
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nation
a politically organized body of people under a single government
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national capital
the capital city of a nation
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neighborhood
an area within a city or town that has some distinctive features (especially one forming a community)
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New Jersey
a Mid-Atlantic state on the Atlantic; one of the original 13 colonies
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North America
a continent (the third largest) in the western hemisphere connected to South America by the Isthmus of Panama
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North Pole
the northernmost point of the Earth's axis
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ocean
a large body of water constituting a principal part of the hydrosphere
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ocean current
the steady flow of surface ocean water in a prevailing direction
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parallel
being everywhere equidistant and not intersecting
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park
a piece of open land for recreational use in an urban area
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Pennsylvania
a Mid-Atlantic state; one of the original 13 colonies
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pipeline
a pipe used to transport liquids or gases
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place
a point located with respect to surface features of some region
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place of origin
where something originated or was nurtured in its early existence
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plain
not elaborate or elaborated; simple
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plantation
an estate where cash crops are grown on a large scale (especially in tropical areas)
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plateau
a relatively flat highland
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plot
a small area of ground covered by specific vegetation
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pollution
undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities
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population
the people who inhabit a territory or state
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port
a place (seaport or airport) where people and merchandise can enter or leave a country
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position
the particular portion of space occupied by something
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precinct
a district of a city or town marked out for administrative purposes
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precipitation
the falling to earth of any form of water (rain or snow or hail or sleet or mist)
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preservation
the activity of protecting something from loss or danger
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projection
the act of expelling or projecting or ejecting
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province
the territory occupied by one of the constituent administrative districts of a nation
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railroad
a line of track providing a runway for wheels
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rain forest
a forest with heavy annual rainfall
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rainfall
water falling in drops from vapor condensed in the atmosphere
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recycling
the act of processing used or abandoned materials for use in creating new products
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region
the extended spatial location of something
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reusable
capable of being used again
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river
a large natural stream of water (larger than a creek)
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Riyadh
joint capital (with Mecca) of Saudi Arabia located in the central oasis; largest city in Saudi Arabia
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road
an open way (generally public) for travel or transportation
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Ruhr
a tributary of the Rhine
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Russia
a federation in northeastern Europe and northern Asia; formerly Soviet Russia; since 1991 an independent state
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scale
an ordered reference standard
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section
one of several parts or pieces that fit with others to constitute a whole object
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settlement
the act of colonizing; the establishment of colonies
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shelter
protective covering that provides protection from the weather
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shopping center
mercantile establishment consisting of a carefully landscaped complex of shops representing leading merchandisers; usually includes restaurants and a convenient parking area; a modern version of the traditional marketplace
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site
the piece of land on which something is located (or is to be located)
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situation
physical position in relation to the surroundings
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smog
air pollution by a mixture of smoke and fog
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society
an extended social group having a distinctive cultural and economic organization
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soil
material in the top layer of the surface of the earth in which plants can grow (especially with reference to its quality or use)
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soil conservation
protection of soil against erosion or deterioration
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solar energy
energy from the sun that is converted into thermal or electrical energy
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South
the region of the United States lying to the south of the Mason-Dixon line
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South America
a continent in the western hemisphere connected to North America by the Isthmus of Panama
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South Pole
the southernmost point of the Earth's axis
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Spain
a parliamentary monarchy in southwestern Europe on the Iberian Peninsula; a former colonial power
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sports stadium
a large structure for open-air sports or entertainments
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state
the way something is with respect to its main attributes
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storage
the act of storing something
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stream
a natural body of running water flowing on or under the earth
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suburban area
a residential district located on the outskirts of a city
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territory
a region marked off for administrative or other purposes
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Texas
the second largest state; located in southwestern United States on the Gulf of Mexico
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timber
the wood of trees cut and prepared for use as building material
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time zone
any of the 24 regions of the globe (loosely divided by longitude) throughout which the same standard time is used
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tornado
a localized and violently destructive windstorm occurring over land characterized by a funnel-shaped cloud extending toward the ground
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town
an urban area with a fixed boundary that is smaller than a city
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township
an administrative division of a county
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trade route
a route followed by traders (usually in caravans)
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trade wind
steady winds blowing from east to west above and below the equator
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transportation
the act of moving something from one location to another
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transportation system
a facility consisting of the means and equipment necessary for the movement of passengers or goods
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United States
North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776
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urban area
a geographical area constituting a city or town
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vegetation
the process of growth in plants
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village
a settlement smaller than a town
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volcano
a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt
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volume
the property of something that is great in magnitude
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waterway
a navigable body of water
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weather
the atmospheric conditions that comprise the state of the atmosphere in terms of temperature and wind and clouds and precipitation
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West Coast
the western seaboard of the United States from Washington to southern California
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wetland
a low area where the land is saturated with water
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wildlife
all living things (except people) that are undomesticated
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windward
the direction from which the wind is coming