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24 Cards in this Set
- Front
- Back
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the process in which weathered rocks are picked up and moved from one place to another
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erosion
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the part of the erosion process in which sediment is placed in a new location, or deposited
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deposition
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the downhill movement of masses of rock and soil
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mass wasting
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all the land drained by a specific stream system.
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water shed "drainage basin"
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is a ridge from which water drains to one side or the other
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divide
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is an area of land on either side of a stream that is under water when a stream floods
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floodplain
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a fan shaped deposit of sediments a the base of a mountain
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alluvial fan
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is the area of land formed by the build up of sediment at the end or mouth of a river
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delta
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is a basin that forms when the roof of a cave becomes so thin that it suddenly falls in
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sinkhole
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rainwater and water from melting snow flow down sloping land, carrying rock and soil particles. The water makes it way to the river, which then carries the sediment along. The sediment gets deposited on the rivers bottom, banks, or floodplain, or near its mouth. waves in oceans and lakes also carry sediment and deposit it to form beaches and other features.
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water erosion
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strong winds lift tiny particles of dust and carry them long distances . when the wind dies down the particles drop to the ground. wind can also push larger particles of sand along the ground.
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wind erosion
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a large mass of rock slides as a unit down a slope.
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rockslide
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is a slide of loose debris that moves as a single unit
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slump
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the weight of heavy mass of soil moving slowly downhill can be great enough to crack a buildings walls
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creep
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consists of debris with a large amount of water. this often happen in mountain canyons and valleys after heavy rains
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mudflow
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what are important things gravity does?
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-causes water to move downward carrying and depositing sediment as it flows
-can pull huge masses of ice slowly down mountain valleys -causes dust carried by wind to fall to the earth. |
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young river
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slope- steep slope on rocky substrate
floodplain- very small to none sites of erosion- along the bottom |
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mature river
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slope- less steep slope, some sediments and rocky
floodplain- water and river begin to meander though floodplain - sites of erosion- some on bottom and some on side. |
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old river
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slope- no slope or very little slope
floodplain- wide floodplain with deposition big meanders and ox bow lakes sites of erosion- only on side and some deposition in channel |
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what is the age of a river based on
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slope and substrate
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during a flood the stream may cut a new channel that bypasses a meander. the cut off meander forms a cresent shaped lake, called?
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an ox bow lake
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is a structure that holds back and controls the flow of water in a river or other body of water
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dam
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a_____ is a type of mass wasting
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landslide
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as_____ decreases sediments drop out of water, heaviest sediments first. gravel,sand,silts,clay
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velocity
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