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rivers are defined as narrow bodies of water that move along a certain path. they have a source , which is where the river begins and a mouth w/c is the larger body of water where the river flows into. since water flows downward and along the easiest or deepest path, many rivers start in a higher area such as mountains. as rivers move along, they change the face of the earth that they flow over by wearing away the land and also by causing buildup at the end of the river. the mud and sand that builds up at the mouth of a river is called a delta. when one stream meets another and they merge together,the smaller stream is known as a tributary. it takes many tributary streams to form a river
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