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Weathering & Erosion & Deposition

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Yeeun Chu

on 29 April 2013

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Transcript of Weathering & Erosion & Deposition

Weathering & Erosion &Deposition Yeeun Chu Erosion Deposition What is Deposition? Types of Deposition Potential Energy What is erosion? What is weathering? Types of weathering Weathering Weathering is breaking down earth's crust. Mechanical Weathering: Erosion is a fancy word for carrying weathered rock away. Water Erosion Potential Energy is energy that is stored and waiting to be used. When it is used, it becomes kinetic energy. Deposition is adding sediment onto a landform. Alluvial fans = A wide, sloping deposit of sediment formed where a stream leaves a mountain range. This deposit is shaped like a fan. Abrasion = Weathering rock by grinding. Mechanical Weathering Chemical Weathering Oxygen: This links up with some rocks, forming oxides. Oxides can break up rock. Chemical Weathering: Kinetic Energy Kinetic energy is energy in
use. This energy is in
motion. This is a picture of weathered rock. Runoff: Runoffs are caused when water moves over land carrying particles with it.The amount of rain, shape of the land, plants, type of soil, and how people use the land effects the area of the runoff. Runoff happens often in deserts because they have less plants. Deserts have high runoff and erosion because they have less plants Temperature changes = Heat makes rock expand and cold makes rock contrast. When expanding and contrasting continuously happen to the rock, it is strained. Strain makes rock crack. Frost action (freezing/thawing/ice wedging) = This happens because water expands as it turns to ice. Water seep into cracks of rocks, and freezes. Root action/Plant growth = Some plants use roots to grow into cracks of rocks. The rocks are split by the plants as they grow. Animal activity = Ants, worms,woodchucks, and other animals dig holes in the ground making air and water weather the rock. Rainwater: Water links up with rock's minerals or dissolves it and form substances that break away the rock. Carbon dioxide: This dissolves in rainwater. Water and carbon dioxide creates carbonic acid that dissolves limestone. More water = more erosion Acid rain: Acid rain weather rock by polluted air which mix as rain. The rock dissolves rapidly. Soil on flood plains =When there is a flood, rain or snow causes a river water to spread across the plains. When the flood water finally retreats, it deposits sediment as new soil. Deltas =Rivers end its journey when it flows into an ocean or a lake. Because the water is no longer flowing downhill, the water slows down. The sediment in the water drops to the bottom, and the sediment deposited forms a delta. Water Deposition Water deposition Wind deposition Has a weak force but it is powerful shaping where there are few plants. Wind deposits by deflation and abrasion. Wind can deposit only small particles such as sand and silt. Sand dunes are deposits of wind-blown sand. Sand dunes are formed when wind swept the sand across the desert, piling up dunes. Loess deposits are sediment that is finer than sand piled up. Wind Deposition Release of pressure: This cracks the rock by potencial energy turning into kinetic energy. Rills Gullies Streams Rivers Tributaries make streams larger. Clay = Size: This is the smallest particle
Texture: It is smooth and heavy.
Clay can absorb water.

Silt = Size: between clay and sand

Sand = Size: It's the second largest particle of soil
Texture: Coarse Stream Bed This is a shape of a stream, where the inner part is deeper. Sediment Load Sediment Load is the process of when sediment moves. Slump: A large area of land falling off by a slope. mudflows: It's a type of water erosion where mud flows down because of the steep slope. Creep: A slow mass movement where sediment moves down the slope. Mass Movement This is a example of water deposition.
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