1.2 Relative Dating Answers

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Which is the first step that geologists must do to compare rock layers at distant locations?

find the absolute age of rocks at both locations

compare a layer at one location to layers at other locations

identify index fossils in one or more layers at one location

collect fossils from different locations to study the organisms’ lifestyles

In which situation is the principle of cross-cutting relationships useful in determining relative age?

A fault breaks through sedimentary layers.

Fossils of two different species are found in different rock layers.

Sedimentary layers form over millions of years in a lake bottom.

Lava flows form on top of one another from several eruptions over time.

Which correctly lists three different geologic features that help scientists determine the relative ages of rocks by their positions?

magma, erosion, and intrusions

erosion, magma, and cross-cutting relationships

intrusions, index fossils, and magma

index fossils, intrusions, and cross-cutting relationships

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