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Geography
Geography(Rivers)
| Question | Answer |
|---|---|
| What is the source of a river? | Where a river begins |
| What is a tributary? | A stream or river that joins a larger river |
| What is an estuary? | Where a river mouth is tidal |
| What is a river basin? | The entire area witch is drained by a river and its tribuataries |
| What is a watershed? | The high ground that separatates two river basins |
| Name the three ways in witch rivers change the landscape | Erosion, transportation and deposition |
| What is erosion? | Wearing it away |
| What is transportation? | Moving material downstream |
| What is deposition? | Dropping the material |
| Nae the processes need for erosion | Hydraulic action,attrition,abrasion and solution |
| What is hydraulic action? | When the force of water bashes against the bank of the river or coastline |
| What is attrition? | When rocks are in collision with each other |
| What is abrasion? | When rocks, pebbles and stones are hurled against the river bank or coastline |
| What is solution? | Rocks being dissolved in water |
| What does the rate of erosion depend on? | The size,speed and hardness of a river |
| When do rivers deposit material? | When a river looses speed,when the river flows into a sea or lake, when the slope of gradient of the river is reduced |
| Name the stages of a river | Youthful,mature and old age stage |
| Give a feature of the youthful stage in a river | Waterfalls, they are also a feature of erosion |
| How are waterfalls formed? | A layer of hard rock lies on a layer of soft rock, soft rock erodes faster than hard rock. The soft rock is then eroded leaving the rack rock on top to be called the overhang. The water now falls rather than flows and forms a plunge pool |
| Give an example of a waterfall | Torc waterfall,Killarney |
| Name a feature of the mature stage in a river | Meanders |
| Explain how a meander is formed | The outer bend of a meander is deep,and causes the water to flow more quickly,thus causing erosion. The inner bend of a river is shallow and causes the water to move more slowly,thus causing deposition |
| Give an example of where a meander can be found | The river Shannon |
| Name a feature of an old age stage | Levees, also a feature of deposition |
| Explain how a levee is formed | When a river is in flood and spreads its banks out over a flood plain its deposits its load. Larger particles are deposited close to the edge of the river and smaller material is deposited further away. The larger particles build up and form a leeve |
| Give an example of where a levee can be found | The old age stage of the river Liffey |
Created by:
Chimozukee
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