Science, Grades 6-8 119 words

reproduction without the fusion of gametes

the pressure exerted by the atmosphere

(physics and chemistry) the smallest component of an element having the chemical properties of the element

a computer that is running software that allows users to leave messages and access information of general interest

a compact disk that is used with a computer (rather than with an audio system); a large amount of digital information can be stored and accessed but it cannot be altered by the user

natural objects visible in the sky

the process in reproduction and growth by which a cell divides to form daughter cells

(computer science) the part of a computer (a microprocessor chip) that does most of the data processing

(chemistry) any process determined by the atomic and molecular composition and structure of the substances involved

(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight

any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

that part of the energy in a substance that can be released by a chemical reaction

(chemistry) a process in which one or more substances are changed into others

the organs and tissues involved in circulating blood and lymph through the body

a change in the world's climate

(astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit

the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes

(computer science) a series of operations on data by a computer in order to retrieve or transform or classify information

a decrease in rate of change

the kind of intellectual who converts messages from a code to plain text

the system that makes food absorbable into the body

the act of taking something apart (as a piece of machinery)

a system formed by the interaction of a community of organisms with their physical environment

the female reproductive cell; the female gamete

a flow of electricity through a conductor

energy made available by the flow of electric charge through a conductor

the process in which part of the output of a system is returned to its input in order to regulate its further output

the organization of information according to preset specifications (usually for computer processing)

an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia

Italian astronomer and mathematician who was the first to use a telescope to study the stars; demonstrated that different weights descend at the same rate; perfected the refracting telescope that enabled him to make many discoveries (1564-1642)

(genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity

(physics) the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface

a form of energy that is transferred by a difference in temperature

(physiology) metabolic equilibrium actively maintained by several complex biological mechanisms that operate via the autonomic nervous system to offset disrupting changes

the watery layer of the earth's surface; includes water vapor

rock formed by the solidification of molten magma

a system (including the thymus and bone marrow and lymphoid tissues) that protects the body from foreign substances and pathogenic organisms by producing the immune response

electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves

a device that can be used to insert data into a computer or other computational device

a material such as glass or porcelain with negligible electrical or thermal conductivity

a restricted computer network; a private network created using World Wide Web software

any animal lacking a backbone or notochord; the term is not used as a scientific classification

the mechanical energy that a body has by virtue of its motion

the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers

the solid part of the earth consisting of the crust and outer mantle

French chemist and biologist whose discovery that fermentation is caused by microorganisms resulted in the process of pasteurization (1822-1895)

fail to function or function improperly

French chemist (born in Poland) who won two Nobel prizes; one (with her husband and Henri Becquerel) for research on radioactivity and another for her discovery of radium and polonium (1867-1934)

energy in a mechanical form

rock altered by pressure and heat

(astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere

either not matched or unsuitably matched

the relation between two different species of organisms that are interdependent; each gains benefits from the other

the guidance of ships or airplanes from place to place

the sensory and control apparatus consisting of a network of nerve cells

(physics) a process that alters the energy or structure or composition of atomic nuclei

electronic or electromechanical equipment connected to a computer and used to transfer data out of the computer in the form of text, images, sounds, or other media

the process of oxidizing; the addition of oxygen to a compound with a loss of electrons; always occurs accompanied by reduction

a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust

evaluate professionally a colleague's work

the slow passage of a liquid through a filtering medium

synthesis of compounds with the aid of radiant energy (especially in plants)

French physicist; husband of Marie Curie (1859-1906)

the tissue of a plant

the act of preying by a predator who kills and eats the prey

(computer science) a language designed for programming computers

a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope

the act of spreading outward from a central source

organs and tissues involved in the production and maturation of gametes and in their union and subsequent development as offspring

the system for taking in oxygen and giving off carbon dioxide; in terrestrial animals this is accomplished by breathing

the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water

a method of investigation involving observation and theory to test scientific hypotheses

the display of a motion picture

rock formed from consolidated clay sediments

the phenomenon of sediment or gravel accumulating

reproduction involving the union or fusion of a male and a female gamete

the hard structure (bones and cartilages) that provides a frame for the body of an animal

the washing away of soil by the flow of water

the male reproductive cell; the male gamete

the male reproductive cell; the male gamete

a screen-oriented interactive program enabling a user to lay out financial data on the screen

a mechanism that transports magnetic tape across the read/write heads of a tape playback/recorder

a classification of organisms into groups based on similarities of structure or origin etc

part of an organism consisting of an aggregate of cells having a similar structure and function

a computer display that enables the user to interact with the computer by touching areas on the screen

hypothetical universal solvent once sought by alchemists

the address of a web page on the world wide web

animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium

(physics) electromagnetic radiation that can produce a visual sensation

a shared orientation leading to mutual understanding