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8th Grade: 8th Grade Word List: Science (List 1) |
chemical compound ![]() |
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a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight |
chemical element ![]() |
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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 |
comets ![]() |
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celestial object consisting of a nucleus of ice and dust and, when near the sun, a tail of gas and dust particles pointing away from the sun |
continental drift ![]() |
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the gradual movement and formation of continents (as described by plate tectonics) |
continental glaciation ![]() |
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unrestricted ice sheets that once covered much of the northern continents but are now found only at high latitudes |
control ![]() |
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a relation of constraint of one entity (thing or person or group) by another; the state that exists when one person or group has power over another |
crustal deformation ![]() |
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referring to the physical deformation of land, the change occurs from within the earth's crust due to the folding and faulting processes that affect the continental plates |
DNA ![]() |
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a long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix; associated with the transmission of genetic information |
forces ![]() |
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vector quantity that tends to produce an acceleration of a body in the direction of its application |
Law of Conservation of Matter ![]() |
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a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system |
net forces ![]() |
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a measure of the force being exerted on an object; zero net force means an object is at rest or moving at a constant speed |
pH ![]() |
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a figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid, and higher values more alkaline |
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