Question

Which statement explains one reason why unconformities occur?

Rocks along a fault break and move.
Igneous rock forms at Earth’s surface.
No sediment is deposited over a long time.
Igneous rock forms between sedimentary layers.

Answer 1

Answer:

An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous. In general, the older layer was exposed to erosion for an interval of time before deposition of the younger layer, but the term is used to describe any break in the sedimentary geologic record. The significance of angular unconformity (see below) was shown by James Hutton, who found examples of Hutton's Unconformity at Jedburgh in 1787 and at Siccar Point in 1788.

Explanation:

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Answer 2

Unconformities occur due to no sediment being deposited over a long time.

Explanation:

• An unconformity is a contact among the sedimentary rocks that have a considerable discrepancy in the age of sedimentary rocks, eroded igneous or metamorphic rocks.
• Unconformities demonstrate gaps in the geologic evidence and time period that is not characterized by any type of rocks.
• Unconformities take place when the rocks are eroded, or there is no formation of rock deposits.

The three types of unconformities that occur are

• Angular Unconformity
• Disconformity
• Non-conformities