Video Weathering and Erosion WEATHERING Weathering Breaking down

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Video: Weathering and Erosion

Video: Weathering and Erosion

WEATHERING • Weathering: Breaking down of rocks due to exposure to the atmosphere

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

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

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

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

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

1) Frost Action (Mechanical) • Definition: Water expands when it freezes. • Location: Middle latitudes

Frost Action

Frost Action

2) Abrasion (Mechanical) • Definition: Rocks rub against each other. • Location: Streams and

2) Abrasion (Mechanical) • Definition: Rocks rub against each other. • Location: Streams and Wind

Abrasion

Abrasion

3) Wetting and Drying (Mechanical) • Definition: Mud Cracks • Location: The Ground

3) Wetting and Drying (Mechanical) • Definition: Mud Cracks • Location: The Ground

Wetting and Drying

Wetting and Drying

4) Plant Action (Mechanical) • Definition: Tree roots cause cracks • Location: Underground

4) Plant Action (Mechanical) • Definition: Tree roots cause cracks • Location: Underground

Plant Action

Plant Action

5) Animal Action (Mechanical) • Definition: Burrows • Location: Worms, Mammals

5) Animal Action (Mechanical) • Definition: Burrows • Location: Worms, Mammals

Animal Action

Animal Action

6) Exfoliation (Mechanical) • Definition: Peeling away layers of rocks • Location: Results from

6) Exfoliation (Mechanical) • Definition: Peeling away layers of rocks • Location: Results from tectonic uplift

Exfoliation

Exfoliation

1) Hydrolysis (Chemical) • Definition: Reaction with water (feldspar-clay, anhydrite-gypsum) • Location: Moist Climates

1) Hydrolysis (Chemical) • Definition: Reaction with water (feldspar-clay, anhydrite-gypsum) • Location: Moist Climates

Hydrolysis ←Un-weathered Feldspar is turned into clay minerals→

Hydrolysis ←Un-weathered Feldspar is turned into clay minerals→

2) Oxidation (Chemical) • Definition: Reaction with oxygen. • Location: Iron will rust.

2) Oxidation (Chemical) • Definition: Reaction with oxygen. • Location: Iron will rust.

Oxidation (Rust)

Oxidation (Rust)

3) Carbonation (Chemical) • Carbonation: CO 2 & water form carbonic acid. • Location:

3) Carbonation (Chemical) • Carbonation: CO 2 & water form carbonic acid. • Location: Limestone/Marble (calcite)

Carbonation

Carbonation

4) Decay Acids (Chemical) • Definition: From decaying plants and animals • Location:

4) Decay Acids (Chemical) • Definition: From decaying plants and animals • Location:

Decay Acids

Decay Acids