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11 terms

Science Study Guide Part 8 of 11

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Metamorphic
High pressure can change an igneous rock into a _________ rock.
Sediments
The smaller particles of rock or the remains of living things that make up sedimentary rocks are called _________.
Sedimentary
Fossils usually occur in _________ rock.
Trace
Footprints and trails are examples of _________ fossils.
Relative
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 _________.
Older
Rock layers are always _________ than the faults that cut across them.
Periods
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 _________.
Hard
Generally, only the _________ parts of organisms become fossils.
Remains of prehistoric dead organisms
What is a fossil?