Warm up Monday 12/12 What are the two main types of weathering?

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Presentation transcript:

Warm up Monday 12/12 What are the two main types of weathering? I have your test scores from Friday! You may ask to see your grade after notes!  Make ups are due Wednesday 12/14 Test Corrections due Friday 12/16

Unit 4.1 Weathering

Mechanical Weathering Frost Wedging- alternate freezing & thawing of water

Exfoliation- peeling away of large sheets of loosened material

Abrasion- when rocks rub against each other

Chemical Weathering Oxidation- when oxygen unites chemically with a mineral. Ex. Rust (iron oxide)

Hydration- when water unites chemically with minerals.

Mechanical Weathering Chemical weathering Pressure/stress release Organic acid (moss, lichen, or pine needles) Abrasion by wind, water, or human activity Hydrolysis (reacting with water) Gravity (mass wasting) Acid precipitation Exfoliation Hydration (dissolving in water) Ice wedging Oxidation (metal and oxygen) Biological (animal burrows, roots)

Rates of Weathering Surface area - If particle size goes down then, weathering rate goes up (more surface area exposed). Weathering eats away sharp edges first (makes things round)

Rates of Weathering Climate- the average weather of a location over time

Differential Weathering Different minerals weather at different rates. Hard rocks weather slowly Soft rocks weather quickly

Warm up Tuesday 12/13 Come get a cup from the front of the room, but DO NOT open it until I tell you to do so! (one per table!) Which type of weathering will be fastest? Record you answer on your lab handout under “Hypothesis”

Sugar Cube Weathering Lab These Sugar Cubes are NOT meant to be eaten! Be sure to record your times accurately in SECONDS! Your data should be represented using a BAR GRAPH which should include… -A title -Labeled axies Answer the Analysis quests in COMPLETE SENTENCES!

5 Minute Timer https://www.youtube.com/watch?v=fnf- GBHn-18