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| A nonsolid state of matter in which the atoms or molecules are free to move past each other, as in a gas or liquid |
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| A series of events in which one organism eats another and obtains energy |
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| A push or pull exerted on an object in order to change the motion of the object; force has size and direction |
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| Evidence that an organism once existed in an area; can be part of the organism's body or a mark or print left by the organism |
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| An energy-rich substance (such as coal, oil, or natural gas) formed from long-dead organisms |
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| The way a mineral looks when it breaks apart in an irregular way |
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| A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity |
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| A hard, colorful mineral that has a brilliant or glassy luster and is valued for its appearance |
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| An organism's genetic makeup, or allele combinations |
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| A record of the geologic events and life forms in Earth's history |
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