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Chapter 14: Weathering.

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Presentation on theme: "Chapter 14: Weathering."— Presentation transcript:

1 Chapter 14: Weathering

2 Section 1: Weathering Process

3 Weathering: breaking down of rock @ Earth’s surface
Dania Beach, FL

4 Mechanical Weathering
Physically broken into pieces, composition NOT changed Agents of M.W. – ice, plants & animals, gravity, running water, & wind Includes exfoliation – layers peel away, result of decompression

5 Ice Wedging Water seeps into cracks & freezes, splitting rock further apart Areas – Northern US w/winters Makes potholes in roads

6 Abrasion processes of scraping away material
Gravity, ice, running water, & wind

7 Plant & Animal Activity
Roots of plants- grows into rock and creates wedges Burrowing Animals dig, create holes, Move soil & expose rock

8 Blue Hole – Florida – dissolved limestone
Chemical Weathering Break down as a result of chemical reactions Changes into new substances Composition & appearance change Blue Hole – Florida – dissolved limestone

9 Oxidation Combines with O2
Common w/iron minerals, red soil, Fe + 3O2  2Fe3O3 Surface of Mars

10 Hydrolysis Leaching Many minerals react w/water
Water moves dissolved minerals down away from surface Leaching

11 Florida limestone  caverns & sinkholes
Carbonation CO2 dissolved in air forms carbonic acid, H2CO3 Minerals form carbonates Limestone’s calcite weathers easily Florida limestone  caverns & sinkholes

12 Organic Acids Formed by lichens & mosses
Weak acids breakdown surfaces, seep into cracks

13 Acid Precipitation Use of fossil fuels makes it more acidic
Weathers rock faster Clean Air Act of reduced emissions

14 End of Section 1 Review 1. Identify 3 agents of mechanical weathering 2. Describe how ice wedging weathers rock 3. Explain how 2 activities of plants or animals help weather rocks or soil 4. Compare mechanical and chemical weathering processes 5. Identify and describe 3 chemical processes 6. Compare hydrolysis, carbonation, and oxidation 7. Summarize how acid precipitation forms 8. Which 2 agents of weathering would be rare in a desert? Why? 9. An automobile exhaust contains nitrogen oxides. How might these pollutants affect chemical weather processes?


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