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C2- landform

C2- landform. Ms. Leung. Focus. We have been looking at how things change the Earth. From inside the earth (the shifting of the plates) and from the outside with weathering and erosion. Today we are going to focus on how the rivers change the land. River.

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C2- landform

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  1. C2- landform Ms. Leung

  2. Focus • We have been looking at how things change the Earth. • From inside the earth (the shifting of the plates) and from the outside with weathering and erosion. • Today we are going to focus on how the rivers change the land.

  3. River • Rivers begin high in the mountains or hills as small tributaries. • Tributaries- is a stream or a river that flows into a main stem or a river. Tributaries do not flow directly into an ocean or a sea. • Tributaries are fed by run-off. • Run-off- Precipitation that flows across the land’s surface or falls into rivers and streams. • The area where the water is drained is called a watershed. • Watershed- Area from which water is drained; region that contributes water to a river or river system.

  4. Water flows down steep hills faster • The speed at which the water flows down hill is directly linked to how much sediment the river can carry. • Sediment- Pieces of material carried and deposited by water and wind. • Larger faster flowing streams can carry larger loads of sediment. • Sediment ranges in size from large boulders to sand and silt and dissolved materials.

  5. As the water flows down the slope into flatter land… water slow down!!! • When the water slow down, the sediment begins to DROP. • When the river slow down and the sediment will thick the rivers bend. • Meanders- Bends or S-shaped curves in a river - Here the river erodes material on the outer side deposits material on the inner side.

  6. Flood plains • As the land continues to flatten flood plains may form along the banks of the river. Some of the world’s most important agriculture is found in the flood plains. • Flood Plain- Land that is likely to be underwater during a flood. A river may over flow its banks following a heavy rain. When it does it releases sediments. Over time sediments build up creating fertile farmland.

  7. All River eventually end as they empty into a lake or ocean • This is called the MOUTH • Mouth (of a river)- is the place where the river flows into the ocean. • At the mouth of the river, the water slow down so much that it drops MOST of its sediment there. The sediment forms a DELTA. • Delta- Fan shaped region formed by deposits of sediments found at the mouth of a river. • Deltas are also a VERY fertile source of soil.

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