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Slide Notes

Weathering is the breaking down of rock through mechanical and chemical means.
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Weathering

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PRESENTATION OUTLINE

Weathering
Mechanical & Chemical
Stephen Kim

Weathering is the breaking down of rock through mechanical and chemical means.

MECHANICAL

Mechanical weathering, also known as physical weathering, is when rocks are broken down by air, water, or living organisms.
Photo by cobalt123

WATER

Mechanical
Water can change the landscape by erosion and deposition.

Also by ice wedging.

ICE WEDGING

Water - Mechanical
Water flows into a crack where it sits and over night freezes. Because ice expands when frozen it deepens the crack in the rock. During the day it thaws and refreezes the next night. This process continues and the crack deepens until the rock splits.
Photo by davebloggs007

AIR

Mechanical
Not only does water erode the landscape but so does air in a similar fashion.

Winds pick up bits of sand and rock which chip away at larger pieces of rock.
Photo by Zach Dischner

ORGANISMS

Mechanical
Roots can grow in the cracks of rock. While the tree grows it fills the cracks and forces the rock to break.

CHEMICAL

Chemical weathering occurs when particles in the rock react with other agents such as air creating rust or water and carbon dioxide creating carbonic acid.
Photo by Knowsphotos

OXYGEN - OXYDATION

Chemical
Photo by morgamic