Video Weathering and Erosion WEATHERING Weathering Breaking down
Video: Weathering and Erosion
WEATHERING • Weathering: Breaking down of rocks due to exposure to the atmosphere
Two Types of Weathering 1) Mechanical (Physical): When rocks are broken down into smaller pieces (physical change) 2) Chemical: Mineral composition is changed
Type M E C H A N I C A L Definition Location Frost Action Freezing and Thawing ice cracks rock. Abrasion Scraping and Grinding Rocks Mid-latitudes Wetting and Mud Cracks Drying On the gound Plant Action Roots Underground Streams
Mechanical Weathering (Continued) Type Definition Animal Action Burrows Exfoliation Peeling away Location
Chemical Weathering Type Definition Hydrolysis/ Hydration Oxidation Dissolved by water. Reacts with oxygen. Location Iron (rust) Carbonation Reacts with CO 2. Decay Acids Carbonic Acid Dead things.
1) Frost Action (Mechanical) • Definition: Water expands when it freezes. • Location: Middle latitudes
Frost Action
2) Abrasion (Mechanical) • Definition: Rocks rub against each other. • Location: Streams and Wind
Abrasion
3) Wetting and Drying (Mechanical) • Definition: Mud Cracks • Location: The Ground
Wetting and Drying
4) Plant Action (Mechanical) • Definition: Tree roots cause cracks • Location: Underground
Plant Action
5) Animal Action (Mechanical) • Definition: Burrows • Location: Worms, Mammals
Animal Action
6) Exfoliation (Mechanical) • Definition: Peeling away layers of rocks • Location: Results from tectonic uplift
Exfoliation
1) Hydrolysis (Chemical) • Definition: Reaction with water (feldspar-clay, anhydrite-gypsum) • Location: Moist Climates
Hydrolysis ←Un-weathered Feldspar is turned into clay minerals→
2) Oxidation (Chemical) • Definition: Reaction with oxygen. • Location: Iron will rust.
Oxidation (Rust)
3) Carbonation (Chemical) • Carbonation: CO 2 & water form carbonic acid. • Location: Limestone/Marble (calcite)
Carbonation
4) Decay Acids (Chemical) • Definition: From decaying plants and animals • Location:
Decay Acids
- Slides: 26