Warm-Up: Thur 5/1 What is the difference between weathering and erosion?

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Presentation transcript:

Warm-Up: Thur 5/1 What is the difference between weathering and erosion?

Weathering Notes Title and date your notes! Use Cornell Notes style Please focus and don’t distract

Weathering vs Erosion Weathering: breaks down rock and other substances Erosion: removal of rock particles by wind, water, ice, and gravity

Weathering affects the surface area of rock Weathering affects the surface area of rock. The more a rock is weathered, the more surface area is exposed, the faster weathering acts!

How do we know? Weathering and erosion have been occurring on Earth since our atmosphere first formed, billions of years ago. How do we know? Uniformitarianism: same processes that operate today operated in the past Evidence we have supports theory No evidence against theory

Types of Weathering Mechanical Weathering: physical breaking down of rock Release of pressure Freezing and thawing Animal actions Plant growth Abrasion (wearing away by particles carried by wind and water)

Types of Weathering Chemical Weathering: breaks down rock by chemical changes (chemistry: substances interacting and changing other substances) Water (H2O): lots of substances dissolve in water Oxygen (O2): (oxidation: iron combining with oxygen to produce rust) Carbon dioxide (CO2): forms weak acid in water Living organisms: also produce weak acids Acid rain: pollution from burning fossil fuels mixes with rain

How fast? What is the rate of weathering, or how fast does weathering occur? Depends . . . . Type of rock permeable rock (rock with small holes) Climate Human activities