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Lesson 2 Vocab

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Across
3
A break in earths crust
6
What geologists use to determine the relative age of sedimentary rocks
7
A rocks age compared to another rocks age
8
Lava that hardens on the surface of earth
Down
1
A widely distributed organism that existed for a short time
2
A gap in the geologic record
4
The number of years since the rock formed
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Magma that cools onto a mass of igneous rock