stuff about fossils for science testtt
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| The change of living things over a long period of time | evolution
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| only what part of an organism can become a fossil | hard part(s)
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| how many and what are the five different kinds of fossils | 5: casts and molds, carbon film, trace fossil, preserved remains and petrified
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| casts and molds | a cast is a solid copy of the organism. A mold is a hollow area in the sediment that is in the shape of an organism.
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| Trace Fossil | Provides evidence of activities of an organism. Examples are ft prints of worm holes.
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| Preserved Remains- | Are the original remains of ancient life. They can be preserved in amber (tree sap), tar or ice.
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| petrified | When minerals replace the hard parts of an organism. Petrified means “turned to stone”.
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| index fossil | Is an organism that is widely distributed around the world, but only lived a short period of time.
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| relative age | Is the age of a rock as compared to other rocks.
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| absolute age | Is the exact age of the rock since it was formed, its birth.
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| Law of Superposition | States that the oldest rock layers will be on the bottom with younger rock layers above.
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| Radioactive dating | allows scientists to find the absolute age of a rock by finding out the amount of radiation in the rock.
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