A pediment is an erosional surface underlain by solid rock, while a bajada is depositional and is underlain by sediment.

Name: A pediment is an erosional surface underlain by solid rock, while a bajada is depositional and is underlain by sediment.
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This statement is true. A pediment forms due to erosion of the bedrock surface, while a bajada forms due to deposition of sediment (usually alluvial) in the foothills and valleys.

A Pediment Is an Erosional Surface Underlain by Solid Rock