Weathering, Erosion and Depostion. Weathering The breaking down of rocks into small particles such as sand and pebbles. There are two types of weathering:

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Presentation transcript:

Weathering, Erosion and Depostion

Weathering The breaking down of rocks into small particles such as sand and pebbles. There are two types of weathering: Physical and Chemical weathering.

Physical Weathering There are several types: Exfoliation (flaking) of rocks due to expansion in extremely high daytime temperatures contraction in very cold nights.

Physical Weathering Ice Wedging – water that gets into the cracks of rocks freezes and expands to split the rock.

Physical Weathering Abrasion – particles such as sand are carried by the wind or water and act like sandpaper.

Physical Weathering Tree Roots – roots growth can weaken dirt or work their way into rock cracks

Physical Weathering Animals or Man – wearing the way of rock or soil by walking or use of machinery.

Chemical Weathering When natural chemicals break down rocks Acid rain – from air pollution

Chemical Weathering Natural Acid – from decaying plants

Erosion The process of carrying away the small rock, sand or pebble particles. The agents of erosion are: Wind

Erosion The process of carrying away the small rock, sand or pebble particles. The agents of erosion are: Gravity

Erosion The process of carrying away the small rock, sand or pebble particles. The agents of erosion are: Water

Erosion The process of carrying away the small rock, sand or pebble particles. The agents of erosion are: Animals or Man

Deposition The depositing or dropping of eroded material in new location. Delta or Alluvial Fan

Deposition Mountain Bases