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| A large body of air that is characterized by similar temperatures and amounts of moisture at any given altitude. |
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| The force exerted by the weight of a column of air above a given point. |
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| The gaseous portion of a planet; the planet's envolope of air; one of the traditionals subdivisions of Earth's physical enviorment. |
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| The number or protons in the nucleus of an atom. |
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| All life on Earth; the parts of the solid Earth,hydrosphere, and atmosphere in which living organisms can be found. |
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| A massive star that has collapsed to such a small volume that it's gravity prevents the escape or everything, including light. |
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| The total amount or sediment a stream is able to transport. |
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| A force that holds together atoms that form a compound. |
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| The process by which the internal structure of a mineral is altered by the removal and/or addition or elements. |
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| The first layer of the solar atmosphere found directly above the photosphere. |
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| A front along which a cold air mass thrusts beneath a warmer air mass. |
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| A small body made of rocky and metallic pieces held together by frozen gases; Comets generally revolve about the sun in an elongated orbit. |
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| Partly decomposed organic material that is used as fertilizer. |
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| A substance formed by the chemical combination of two or more elements in definite proportions and usually having properties different from thoes of its constituent elements. |
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