Question

A large amount of sediment is deposited on a pkain in a short amount of geologic time. Which of the following correctly describes a possible result
A- the crust subsides due to the motion of the sediment as it is deposited
B-the crust subsides due to the weight of the sediment that accumulates.
C- the crust is uplifted due to groundwater infiltrating the sediment
D- the crust id uplifted due to the difference in weight between the sediment and the bedrock

Answer 1

The answer is B. The weight of the sediments causes the crust to subside while the crust in the flanks is uplifted in opposite force. It is noteworthy that this is one way how fold mountains are formed. The sediments are squeezed between the uplifting flanking crusts and folds are formed in the sediments.  This phenomenon is common in the seas and oceans where sediments are deposited on the beds by inflowing inland rivers.