Chemical and/or Physical breakdown of rock Physical Weathering (mechanical) breakdown of rock into smaller pieces –Does not involve a chemical change.

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Presentation transcript:

Chemical and/or Physical breakdown of rock

Physical Weathering (mechanical) breakdown of rock into smaller pieces –Does not involve a chemical change in the rock

Frost Action/Wedging alternate freezing and thawing due to the expansion of water when freezes = potholes

b. Abrasion –Rounding of rocks due to the rocks hitting each other

c. Root Action Roots wedge and grow in rocks

d. Exfoliation Large sheets of loosened rock peel away nevada-caught-fracturing-on-video/ nevada-caught-fracturing-on-video/

Chemical Weathering Breakdown of rock due to a chemical change in the rock Often requires water The higher the temperature, the faster the chemical weathering

a. Oxidation Iron + Oxygeniron oxide, (commonly called rust)

b. Carbonation Carbon dioxide + water = carbonic acid (in rain) – a weak acid Slowly dissolves Limestone and Marble

Karst Topography Caves and Sinkholes

FCGsYhttp:// FCGsY Karst and corvettes 02/12/breaking-news-eight-cars-damaged- by-sinkhole-at-the-national-corvette- museum/?refer=newshttp://blog.hemmings.com/index.php/2014/ 02/12/breaking-news-eight-cars-damaged- by-sinkhole-at-the-national-corvette- museum/?refer=news

c. Hydration Water plus other minerals Ex. Feldspar + water will slowly change into clay

1. Particle Size/Surface Area exposed at Surface The more surface area exposed, the ________ the weathering quicker

Why will smaller particles weather faster? Which will weather faster and why? Pebbles SandSiltClay

2. Mineral Composition a.The harder the rock, the longer it takes to break down b. Calcite/Limestone >> dissolves in acidic water

Which layer, X or Y is more resistant to weathering? (resistant – harder to weather) Y, is hasn’t weathered as much

3. Climate A. Warm, moist climate >>> B. Moist with temperature variations of freezing and thawing >>>