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They also claimed that small pieces of debris found near Stonehenge, which were traced back to the dig site in Wales, were actually transported by the movement of glaciers over half a million years ago, and not brought by ancient masons along with the bluestones.
This section explains how sediment is carried away and deposited elsewhere to wear down and build up Earthâs surface. The section also describes ways that gravity moves sediment downhill. Wearing Down and Building Up (page 253) 1. What is erosion? 2. List the forces that cause erosion. a. b. c. d. e. 3. The material moved by erosion is called . 4.