Question

Stream terraces are composed of either _______ or ______.

Multiple select question.
a) fine windblown sediment derived from volcanic ash that clumped together after landing in a river
b) an erosional surface cut into bedrock
c) marine sediments derived from the last high stand of the ocean
d) stream-derived sediment composing former floodplains

Answer 1

Stream terraces are composed of either an b. erosional surface cut into bedrock or stream-derived sediment composing former floodplains. These terraces can be found along river valleys and provide important information about the history of the landscape.

Step-by-step explanation:

Stream terraces are composed of either b. an erosional surface cut into bedrock or stream-derived sediment composing former floodplains.

Stream terraces can form when a river cuts into its own floodplain during times of increased flow or when tectonic activity causes uplift and the river downcuts into the new landscape. These terraces can be found along river valleys and can provide important information about the history of the landscape.