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- Zzzz
- weathering
- today we are talking about weathering. mechanical and chemical
- first we will learn mechanical weathering
- rebound = Material (water or rock) is removed from a massive rock and with the release of pressure, the rock rises, and then cracks.
- Animal activity = As animals burrow they cause rocks to break and sediment to be created by letting in water and other agents of weathering.
- ice wedging = Freezing water expands and causes cracks in rocks to become larger; the water melts and the process repeats itself.
- Plant growth = Growing roots enlarge (make bigger) cracks in rocks.
- Abrasion = Sediment and rocks carried by agents of erosion (wind, water, ice) sand down, grind, scratch other surfaces.
- Extreme temperatures = Rocks heated on the surface (by sun, wildfires) are a different temperature than the inside of the rock, causing stress on the rock which leads it to crack and exfoliate (shed)
- Jake wake up weathering is VERY important
- Now that is the 6 agents of mechanical weathering. Now there are still 5 agents of chemical weathering.
- dude?
- now some of the things on this list you already know alot about but we still have to teach it. maybe you will see it in a new way
- Water = Dissolves the minerals in rock.
- Living organisms (root tips) = Their roots give off a weak acid that dissolves rock
- Carbon dioxide = Carbon dioxide + water = carbonic acid
- Acid rain = Burning coal, oil, or gas + water vapor in clouds = acid rain
- Oxygen = Oxygen + iron = rust (iron oxide)
- Now I hope that you liked learning about it. Tomorrow we will learn about the water cycle and don't worry it will be a MUCH longer lesson.
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