biosphere
the regions of the Earth where living organisms exist
weather
atmospheric conditions such as temperature and precipitation
mantle
a sleeveless garment like a cloak but shorter
elevation
distance of something above a reference point
ecosystem
organisms interacting with their physical environment
equinox
when the sun crosses the plane of the earth's equator
hydrosphere
the watery layer of the earth's surface
lithosphere
the part of the Earth consisting of the crust and mantle
magma
molten rock in the earth's crust
tsunami
a cataclysm resulting from a destructive sea wave
hurricane
a severe tropical cyclone usually with heavy rains and winds
tectonic
pertaining to the structure or movement of the earth's crust
orbit
the path of a celestial body in its revolution about another
season
one of the natural periods into which the year is divided by the equinoxes and solstices or atmospheric conditions
steppe
an extensive plain without trees
solstice
when the sun is at its greatest distance from the equator
volcano
a fissure in the earth's crust through which gases erupt
tide
the periodic rise and fall of the sea level