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amount of runoff is affected by several factors
amount of rain, length of time it falls, steepness (slope) of the land, and the amount of vegitation
rill erosion- during a heavy rain, a small ______ forms and carrys away soil creating a groove called a channel
heavy rains remove large amounts of soil and sediment from a rill channel, forming a gully
______ erosion- water in a stream picks up sediments from the bottom and the sides of iyts channel, making the channel deeper and wider1=
Young stream- flows swiftly through a steep valley
may have whitewater rapids and waterfalls; erodes the stream bottom faster that the sides
Mature stream- flows smoothly through its valley
erodes more on its sides; curves called meanders form; carves a broad and flat valley floor called a floodplain
Flooding- when too much water enters a river system, it overflows its banks
dams- built to control the flow of water downstream/ levees- mounds of the earth built around the sides of a river toto prevent flooding
fan-shaped area formed by sediments that are deposited as water empties into an ocean or lake
fan-shaped area formed by sediments deposited as water empties from a mountain valley onto a flat open plain
Groundwater- water that soaks into the earth and collects in the pores of the ____ underlying the soil
soil and rock are _________ if water can pass through the pore spaces EX: _________
waves pound against shores, breaking rocks into smaller peices
move large amounts of sediment/ colide with thw shore at angles creating longshore currents, which act as rivers of sand in the ocean
beaches- deposits of sediments that are parrallel to the shore
made of rock and shell fragments/ fragile because longshore surrents consatantly carry sand down the shore to form barrier islands, spits, sandbars, and baymouth bars/
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