Chapter 5 Weathering, Soils, & Mass Movements

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Presentation transcript:

Chapter 5 Weathering, Soils, & Mass Movements

Mechanical Weathering Mechanical weathering-physical forces break rock into smaller pieces Does not change the rock’s composition same characteristics as the original rock

Mechanical Weathering Surface area increases as breakup a rock

What Might cause this?

1. Unloading Igneous rock are exposed through uplifting and erosion of overlying rocks

2. Frost Wedging Mechanical breakup caused by the expansion of freezing water in cracks and crevices Sections of rock that are wedged loose and fall apart

Frost Wedging

3. Biological Activity Plant roots grow into cracks in rock and wedge the rock apart Burrowing animals move rocks to the surface mole worm

Chemical Weathering Chemical weathering is the transformation (change) of rock into one or more new compounds

Chemical Weathering Water Most important agent in chemical weathering

Chemical Weathering- Examples Iron on barrels coverts to rust Iron + oxygen (from air) coverts to iron oxide (rust)

Chemical Weathering Rain water mixes sulfur & nitrogen produced from the burning fossil fuels- coal & gasoline Acid rain formed

Chemical Weathering “Acid Rain” Acid rain increases the chemical weathering of stone monuments and structures

WHY?!?! Chemical Weathering The statue of liberty WAS orange Statue of Liberty is green WHY?!?!

Make a Venn Diagram and classify the following terms as either Mechanical, chemical or both Fossil Fuels Now add 5 of your own Animals Water Frost Rust Different chemical structure Same chemical structure Acid Statue of Liberty Unloading Increased surface area Roots Change Weathering