The highest surface on this figure is a river terrace.This terrace:
A)is older than the modern river channel
B)formed sometime in the past
C)predates erosion down to the present level
D)all of these

Question

The highest surface on this figure is a river terrace.This terrace: 
A)is older than the modern river channel 
B)formed sometime in the past 
C)predates erosion down to the present level 
D)all of these

Quizplus · Accepted Answer

A river terrace is a flat or gently sloping landform that is usually situated on one or both sides of a river valley. It is formed when a river downcuts its bed, and then the uplift of the land raises the river level, creating a new floodplain or river channel. This implies that the river terrace formed in the past and is older than the modern river channel. Also, the river terrace was formed before erosion down to the present level, which means that it predates the present level of the river channel. Therefore, all the options are correct, making option D the best answer.

The Highest Surface on This Figure Is a River Terrace