Question

how do unconformities form?​

Answer 1

Answer:

Unconformities are gaps in the geologic rock record. They are surfaces of contact between older rocks and younger sedimentary rocks, formed due to erosion or lack of sediment deposition over extended periods of time.

Explanation:

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Answer 2

Unconformities are a sort of geologic contact—a border between rocks—caused by a period of erosion or hiatus in sediment accumulation, followed by fresh sediment deposition.

Explanation:

• In low-lying areas such as the ocean bottom, river deltas, marshes, basins, lakes, and floodplains, sediments pile layer by layer.

• When sediment is not deposited in a region for an extended period of time, unconformities can form.

• No new layer of rock can develop if sediment is not deposited. This is equivalent to neglecting to place a newspaper on the stack. Unconformities can also form when erosion destroys a layer of rock that has formed previously.