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Geography

Geography(Rivers)

QuestionAnswer
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