Here, we are required identify which statement best explains one reason why Unconformities occur.
The statement which explains one reason why Unconformities occur is the third choice: i.e
No sediment is deposited over a long time
Unconformities can also be referred to as geologic gap.
Unconformity is a situation characterized by "no sediment is deposited over a long time". Unconformity refers to an opening between rocks or mountains. The opening is caused by the effect of water erosion.
The criteria for the occurrence of Unconformities include:
- Situations when rocks desist from normal geologic rules.
- Situations when rocks are eroded before the sediments are deposited.
A geologic gap is synonymously known as pass or saddle.
Therefore, the statement which best fits a reason why unconformities occur is "No sediment is deposited over a long time".
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