Consider the following statements related to river terraces: 1. They are surfaces marking old valley floor or floodplain levels 2. They may be bedrock surfaces without any alluvial cover or alluvial terraces consisting of stream deposits 3. They are basically products of deposition as they result due to vertical erosion by the stream into its own depositional floodplain Which of the statements given above is/are correct?
1 and 2 only
River terraces are step-like remnants of a river's former valley floor or floodplain, left behind when the river cuts down into its own earlier deposits or into bedrock, so they can be bare bedrock surfaces or alluvium-covered surfaces from stream deposits. Statement 3 wrongly generalizes terraces as basically depositional features, when their formation is actually driven by renewed vertical erosion that can expose either bedrock or older alluvial fill, so only statements 1 and 2 are correct.
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