Rivers The beginning of a river is called its source. All rivers have tributaries streams that join the main river River system drains an area called a drainage basin The area between two drainage basins is called a watershed Part of a river that is tidal is called an estuary Mouth of a river is where it meets the sea or a lake C Parker
River processes Speed and energy of water erodes = hydraulic action. Fragments of rock carried by river called the load wear away the banks and river bed = abrasion. Crashing of stones and pebbles carried by the river wears itself away = attrition. Limestone chalk dissolved by carbonic acid = solution C Parker
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