Erosion can make mountains because when the pieces of land collide, they form some mountains. This happens because the ground from below shoots up into a shape. Erosion can happen because of landslides and other things. This is the way Himalayas were believed to be made. This is how erosion can make mountains.
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The group of words that qualifies as a dependent clause as written on the options, is letter A. Because there is no evidence. The rest of the sentences are independent clauses. The word 'because' is a kind of conjunction that begins with a dependent clause. Therefore, the answer is letter A.
okay hold on, they wont let my answer go through so i'll post this and write it in the comments :)