Sediments on earth's surface can have a different composition than the underlying bedrock. how is this best explained

The process of erosion would have translocated sediments to novel locations.  

Explanation:

The bedrock is considered as the hard and solid rock that is found underneath the surface materials like the soil and the gravel. The bedrock comprises granite, while the sediments comprising distinct composition in comparison to them are transported from distinct regions. The sediments can be mediated from one location to another via the procedure called erosion. This transportation results in distinct compositions of the sediments and the bedrock.  

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.