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High pressure can change an igneous rock into a _________ rock.


The smaller particles of rock or the remains of living things that make up sedimentary rocks are called _________.


Fossils usually occur in _________ rock.


Footprints and trails are examples of _________ fossils.


The law of superposition helps geologists determine the _________ age of a rock layer.

Cambrian explosion

At the beginning of the Paleozoic Era, a great number of different types of organisms evolved in an event called the _________.


Rock layers are always _________ than the faults that cut across them.


On the geologic time scale, the Mesozoic Era is divided into the Triassic, Jurassic, and Cretaceous _________.

Paleozoic Era

The era before the Mesozoic Era is the _________.


Generally, only the _________ parts of organisms become fossils.

Remains of prehistoric dead organisms

What is a fossil?

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