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17 Cards in this Set
- Front
- Back
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What is a river source? |
The place where a river begins |
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What is a tributary? |
A stream or river which joins a larger river |
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What is a river mouth? |
Place where a river enters the sea, lake or other river |
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What is the estuary? |
Part of a river mouth that is tidal |
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What is a river basin? |
Total area drained by a river and it's tributaries |
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What is a watershed? |
High ground which separates one river basin from another |
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What is a confluence? |
The place where two or more rivers meet |
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What is a river course? |
The route taken by a river between its source and it's mouth |
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Name the three stages that may occur in the course of a river |
Youthful stage, mature stage and old age stage |
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What are the characteristics of a youthful river? |
Small in size They usually flow down steep slopes Such rivers erode the land over which they flow |
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What is hydraulic action? |
The force of moving wate, which breaks fragments (load) from the bed and the banks of a river. |
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What is abrasion? |
Is when the load hits against the bed and banks of he river and erodes them rapidly |
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What is attrition? |
When the stones carried in the load of the river are themselves worn down. Stones are made smaller by this process |
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What is solution? |
It's when chemicals in the water help to break down some rocks, e.g carbonic acid breaks down limestone |
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Features of erosion by young rivers |
V shaped valleys - have steep sides and very narrow floors (pg 31) Interlocking spurs - areas of high ground which seem to lock into each other as they stick out across a v shaped valley (pg 32) Waterfalls - when a river falls over a vertical slope (pg 33)
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Features of a mature river |
Valley troughs - wide floored valleys with gently sloping sides (pg 34) Meanders - large curves in the course of a river (pg 35) |
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Features of deposition |
Flood plains - low flat land that borders old rivers and which are sometimes flooded by the rivers (pg 36) Levees - narrow raised banks of alluvium found along the banks of some old rivers Ox bow lakes - horseshoe found lakes found near old rivers (pg 37) Deltas - triangular shaped areas of land which form at the mouth of rivers and are made up if alluvium |
