∆ 9. When __________________ are hit by waves over thousands of years, a beach of sand is formed.__
∆ 10. Sand, ________________ and waves hit rocks and smooth out the surface of older rocks.__
∆ 11. ___________ can hold back soil from eroding and also break rocks apart – causing erosion.__
∆ 12. Water flows into cracks of rocks and shrinks / expands when it freezes causing the rock to crack. (pick one)__
∆ 13. As water flows over rocks, it dissolves minerals causing different ___________ to sometimes appear.__
∆ 14. Pounding water, wind, __________________ and rain are major causes of erosion.__
∆ 15. Chemicals in the air / plants contribute to erosion. (pick one)