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Fossils flashcards

Lindsay McBride Science 6th grade Inglés 14 fichas

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1Fossilspreserved traces or remains of living things
2What is the first step of fossil formation?when living things die and are buried by sediments
3What is the second step of fossil formation?soft part decays & hard part stays
4What is the third step of fossil formation?sediment slowly hardens into rock & preserves shape of organism
5What kind of rock are fossils found in? Why?Sedimentary because
1) the layers pile up
2) it wouldn't be in igneous/metamorphic rock because that requires heat or pressure
6Petrified fossils/perimineralized fossilsspaces inside organism are filled w/ minerals from groundwater
7Mold fossilformed when hard part decays and leaves a hollow cavity in shape of organism
8Cast fossilformed when minerals or sediment fill in space in shape of organism
9Carbonaceous film fossilthin layer of carbon on the rock; left when gases/liquids given off by body form an image
10trace fossilsprovides evidence of activity (animal size, speed, behavior)
11original remainsactual remains of organism
12Original remains occur if trapped in ______, ________, or ______.amber, ice, or tar
13index fossilorganisms that existed for a short period of time, lots of fossils from that time period
14Some examples of index fossils with behavior are .....Herd protecting the young
Predator stalking and attacking