Weathering Erosion A Weathering and Erosion 1 Weathering
- Slides: 14
Weathering & Erosion
A. Weathering and Erosion 1. Weathering 2. Erosion Is the break-up of rock due to exposure to the atmosphere. Is the removal and transport of earth materials by natural agents
B. Two types of Weathering 1. Mechanical Takes place when rock splits and breaks into smaller pieces of the same material without changing its composition. 2. Chemical Takes place when the rocks or minerals are changed into different substances
C. Mechanical Weathering Examples 1. Ice wedging -When water seeps into cracks of rocks then freezes (water volume expands 10% when frozen)
2. Wetting & Drying 3. Plants 4. Small Animals 5. Sheet Jointing 6. Exfoliation -Repeated wetting and drying of rock is very effective at breaking up rocks that contain clay. -Roots grow down into tiny cracks expanding and chipping the rock apart. -Earth worms, ants, and rodents dig holes in the soil exposing the under ground to air and water. -When large masses of rock are lifted to form mountains and the surface rock removed, this reduces the pressure on the rock under-ground so the rock begins to expand. -When large sheets of loosened rock break away from a rock outcrop.
D. Chemical Weathering Examples 1. Hydrolysis - Reaction of H 2 O & other substances 2. Oxidation - Reaction of oxygen & other substances 3. Carbonic acid - Dissolves minerals to create underground caverns.
Feldspar +Water = Clay Feldspar A Clay Cliff
Textbook work Summary: Complete the following “Weathering & Erosion” review - Pg. 244 #1 -5 Analyzing Data - Please write out questions and complete in your comp book.
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