Mechanical / Physical Weathering

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Presentation transcript:

Mechanical / Physical Weathering

Mechanical Weathering - The breakdown of rocks into smaller pieces by physical means Also known as physical weathering

Abrasion - Water As rocks and pebbles roll along the bottom of flowing water, they bump and scrape against each other (abrasion), causing these rocks to become rounded and smooth.

Abrasion - WIND blows sand and silt against exposed rock eventually wearing away the rock’s surface. (acts like sandpaper)

Other examples of Weathering by Wind aroundtheworld365.blogspot.com Abrasion by wind: https://www.youtube.com/watch?v=yk3yqPSi_nw Abrasion by wind (don’t use sound

What agent of weathering caused this? Landslide in Brazil Jan. 2011 http://www.cbc.ca/news/canada/british-columbia/story/2008/07/30/bc-highway-rockslide-whistler.html http://www.cbc.ca/news/canada/british-columbia/story/2008/07/30/bc-highway-rockslide-whistler.html

GRAVITY Rocks are pulled down and grind against each other during a rock slide, creating smaller and smaller rock fragments. Anytime one rock hits another rock, abrasion takes place. http://www.wimp.com/rockslide/ Rock slide video

What agent of weathering caused this?

ICE Water seeps into cracks during warm weather. When the temperature drops, the water freezes and expands, causing the ice to push against the sides of the crack. This causes the crack in the rock to widen. These 3 steps repeat until the rock is broken apart.

Frost Wedging aka Ice Wedging

National Geographic Photos Frost Wedging aka Ice Wedging

Plants http://www.city-data.com/forum/houston/1144104-root-barrier-totally-diy-project-report.html http://www.extension.org/pages/61636/problems-with-parking-park-strips

PLANTS Roots grow into cracks in the rocks. As the roots grow, they press on the sides of the crack, making it wider, until the rock breaks apart. Ex. Tree roots breaking up sidewalk

What is causing the changes in Earth’s surface that you are seeing in these pictures? http://www.ehow.com/info_7934416_moth-balls-gopher-repellent.html http://www.dreamstime.com/royalty-free-stock-photography-worker-ants-ant-hill-concept-image11140847

Animals Burrowing animals break up and loosen sediment, pushing it to the surface. This exposes it to other forces of weathering. Ex. Rabbits, worms, ants, coyotes, & mice, prairie dogs, insects, gophers