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Rivers and coasts - Coggle Diagram
Rivers and coasts
Erosion
Abrasion happens in rivers when pebbles strike against the river bed and bank, or on coastlines when waves smash the stones and other bits of sediment against the land.
Attrition is an erosional process. Rocks and pebbles are carried in the flow of a river. They repeatedly knock into each other, which causes the rocks to erode or to break. As the rocks continue to collide, they erode more and more, getting smaller and smaller until they are only sediment.
The four processes of coastal erosion are corrosion, abrasion, attrition, and hydraulic power.
Corrosion is a process of chemical erosion. Rocks or stones can be eroded as water gets into cracks and holes and dissolves the rock through chemical changes. This process can occur with acid rain.
Hydralic action-This is the sheer power of the water as it smashes against the river banks. Air becomes trapped in the cracks of the river bank and bed, and causes the rock to break apart.
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Types of weathering
Physical weathering
Freeze thaw weathering is when Water gets into cracks in the rocks and when the water freezes it crack the rocks in half
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This occurs when rocks are exposed to hot and cold weather The heat makes the outer layer expand.Also the cold at night makes the outer layer contract. The outer layer then peels of. The loose rock is called scree
Chemical weathering
Acid rain is a type of chemical weathering. Acid rain occurs when.The acid in the water reacts with some of the minerals in the rock around it speeding up its eroding progress. This can be dangerous. For example, the acidic ground water could dissolve rocks faster than it did before, so sinkholes could be made quickly anywhere.
Biological weathering
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Animals burrow and beak up the rock. Plant seeds fall into the rocks causing the plats to grow which then breaks the rocks up. Tree roots then expand which causes the rock to widen and blow up
The features are a meander,floodplain,delta,mouth,confluence,watershed,Tributaries
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