1 окт. 2018 г. · Attrition: The velocity of the river causes rocks to collide and break fragments off one another. This causes rocks to become smoother and more rounded. What are the main process of erosion that take place in rivers? Describe the four main types of river erosion? [4] - MyTutor Другие результаты с сайта www.mytutor.co.uk |
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