Weathering, Erosion & Deposition

Weathering B R E A It down K Process by which water, wind and ice break down rocks. There are 2 types of weathering: Mechanical and Chemical

Mechanical Weathering Process by which rocks are broken down into smaller pieces by physical forces. Root Pry Abrasion (grinding) Ice wedging Burrowing of animals

Root Pry

Abrasion -rubbing of sand and gravel

Ice Wedging - freezing and expanding of water causing cracking and breaking Why would it be beneficial to seal concrete?

Burring of Animals

Chemical Weathering the process that breaks down rock through chemical changes. Water – dissolves rock over time Oxygen – combines with iron to form rust (oxidation) Carbon dioxide – dissolves in water to form carbonic acid

Water breaking down rock

Oxygen combining with iron to form rust – “oxidation”

Carbon dioxide dissolves in water to form carbonic acid that weakens limestone and marble

This can cause sink holes and caves

All rocks are effected by weathering! Sedimentary Metamorphic Igneous

Erosion C A R R I E S It away Movement of weathered rock (sediment) by wind, water, ice or gravity

Wind

Water

Ice

Gravity

Erosion Control silt fencing terracing

Deposition D O R It here P Process by which wind, water and gravity leave weathered rock (sediment) in a new location

Wind

Water

Gravity