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