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Rivers
Question | Answer |
---|---|
What are the features of the upper course of a river? | -v shaped valley -interlocking spurs -waterfalls |
What are the features of the middle course of a river? | -meanders -wide valleys |
What are the features of the lower course of a river? | -ox bow lakes -flood plains -deltas -levees |
What is hydraulic action? | power of the moving water erodes the bed and banks of the river |
What is abrasion? | broken material (from hydraulic action) carried by river (known as load) is thrown against bed and banks of river. Wears bed and banks further |
What is attrition? | load itself broken down further as particles bounce off each other and become smooth and rounded |
What is solution? | water dissolves some of the minerals |
What is traction? | large pebbles and stones rolled along river bed by force of moving water |
What is saltation? | small pebbles bounced along river bed |
What is suspension? | small particles held up in water - movement of river is fast enough for them not to drop to bed |
What is solution? | rocks dissolved in water by weak acids |