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Fossils

dunn

How do fossils form? What are the different kinds? What can the fossil record tell us?

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Across
2.gradual change in living things over long time periods
4.a break in Earth's crust
8.widely distributed fossil of organism that existed only briefly
9.preserved remains or traces of living things
12.always younger than rocks below it
13.number of years since a rock formed
15.well tested concept explaining wide range of observations
16.collect fossils; use information to study past life forms
18.extremely thin coating of carbon on rock
19.no longer exists; will never live on Earth again
Down
1.minerals replace all/part of an organism
3.type of rock made of hardened sediments
5.oldest layer of rock is at the bottom of any horizontal layer of rock
6.gap in geologic record; some rock layers lost due to erosion
7.solid copy of an organisms shape
10.evidence of activities of ancient organism; fossilized footprint
11.a hollow area in sediment in the shape of an organism
14.a rocks age compared to ages of other rocks
17.always younger than rock layers around/under it

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