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    				| 1. | In your own words, briefly explain why are the stones near rivers and sea smooth? What role does mechanical weathering play here? | 
| Answer» BREAKING up of rocks by physical forces—works in much the same way. In this natural process, physical forces SPLIT rocks apart but do not change their composition—what they are MADE of. Ice wedging, pressure RELEASE, plant root growth, and abrasion can all CAUSE mechanical weathering. | |