6
lesson pretestMultiple Choice

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Question 6 • TPS EdX Biology

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

Answer
A
A fault breaks through sedimentary layers.
B
Lava flows form on top of one another from several eruptions over time.
C
Fossils of two different species are found in different rock layers.
D
Sedimentary layers form over millions of years in a lake bottom.

Explanation

The principle of cross-cutting relationships says that a geologic feature that cuts through another feature formed later than what it cuts. A fault that breaks through sedimentary layers must therefore be younger than those layers. Lava flows stacked over one another are dated by superposition, while the other choices do not describe a feature cutting across another.

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