Salts may later be deposited by organic activity e. Sand grains bounce along the ground in the wind; when the wind stops or slows down, the sand is deposited and may build sand dunes. Flowing water picks up and moves particles of soil and rock. When the water slows down, for example by reaching flatter land, it starts to drop the particles it is holding.
It drops the largest particles first and the smaller ones as it slows down even further. Alluvial fans are a feature typically created when sediment carried by a mountain stream is deposited due to a rapid change in slope from a high to a low gradient. When the slope angle is high, the stream flows with a high velocity and is able to transport larger pieces of sediment such as pebbles and sand.
When the slope angle is lower the stream loses the energy it needs to carry these larger pieces of sediment and they are deposited. The deposited materials eventually spread out, creating an alluvial fan. The eroded material will eventually be dropped by the eroding agent in a new place.
This last part of the process is called deposition. This topic investigates what happens to the material after being carried by the five agents of erosion and the landscape features formed in the process. Erosion and deposition Deposition occurs when the eroding agent, whether it be gravity, ice, water, waves or wind, runs out of energy and can no longer carry its load of eroded material.
The energy available to the erosion agents comes from gravity, or in the case of wind, the Sun. While the mountain slopes are steep, there is plenty of gravitational energy available to move the eroding material. Sooner or later the glacier or river will reach more gently sloping ground or even flat plains and the energy that is transporting the eroded particles is reduced. It is at this stage that deposition becomes the dominant process, building up low lying areas and creating new land.
Gravity A landslide or mud slide usually occurs quickly, with the slide coming to a halt in a matter of minutes, leaving an area of destruction at the base of the slope affected. Deposition Facts for Kids. What Happens When a Glacier Melts?
Similarities and Differences in Weathering and Erosion. How Does Weathering Happen? What Are the Agents of Weathering? The Effects of Soil Erosion. Types of Depositional Landforms. Forces That Cause Landforms. Types of Weathering and Erosion. Deposition occurs when a river loses energy. This can be when a river enters a shallow area this coud be when it floods and comes into contact with the flood plain or towards its mouth where it meets another body of water.
Rivers flood on a regular basis. The area over which they flood is known as the floodplain and this often coincides with regions where meanders form.
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