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Journey Through Time

Caroline Evans

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Across
5.a rock's age compared with the ages of other rocks
9.the number of years since the rock formed
12.a hollow area in sediment in the shape of an organism or part of one
13.they provide evidence of the activities of ancient organisms
14.the gradual change in living things over long periods of time
15.fossils in which minerals replace all or part of an organism
Down
1.preserved traces or remains of living things
2.the layer of rock that is always the youngest but not necessarily on top
3.the time it takes for half of the radioactive atoms to decay
4.a solid copy of the shape of an organism
6.they tell the relative ages of the rock layers in which they occur
7.Lava that hardens on the surface of the earth
8.a break in the Earth's crust
10.an extremely thin coating of carbon on rock
11.a group of hard shelled animals that evolved in shallow seas more than 500 million years ago

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