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Select statements true of unconformities. Choose one or more: A. There are three major types of unconformities. B. Unconformities represent periods of nondeposition in the rock record. C. Unconformities represent periods of active deposition in the rock record. D. Unconformities represent periods of erosion in the rock record.

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Answer:

The best answer are "A,B,D"

A:There are three major types of unconformities.

B: Unconformities represent periods of nondeposition in the rock record.

D: Unconformities represent periods of erosion in the rock record.

Explanation:

Unconformities are typically buried erosional surfaces that can represent a break in the geologic record of hundreds of millions of years or more.

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