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Eras are subdivided into units of geologic time

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Three long units of time

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A record of the geologic events and the evolution of life forms as shown in the fossil record

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The time it takes for a half of the radioactive atoms to decay

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The atoms of one element break down to form atoms of another element

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Extrusion- Lava that hardens on the surface and forms igneous rock

Intrusion-process of forcing a body of igneous rock between or through existing formations, without reaching the surface.

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If it no longer exists and will never again live on earth it is extinct.

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The fossil record reveals changes in organisms. Older rocks contain fossils of simple organisms. While younger rocks contain fossils of both complex and organisms. (Evolution is the change in living things over time)

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study of life that existed before history

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Study of the earth

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Forces in the earth push up the sea floor into mountains

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1-:Molds- hollow shape left by the organisms
2: Casts- Creates the exact copy  of the organisms
3: Carbon Films- an organisms leaves behind a thin layer of carbon VERY RARE
4: Trace fossils- organisms leave clues behind
5: Reserved remains (cast) - Tar ice or amber

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Nearly all fossils are found in sedimantry rock

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Are the preserved  remains of organisms that were once living

Only 10% of dead organisms turn into fossils