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Lesson 2 Vocab

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