Lectures Part 2

Lectures Part 2 - SC Coast Monthly Average Tipping bucket...

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SC Coast Monthly Average
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Tipping bucket raingauge
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Hyetograph, hourly
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A hyetograph, daily
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Rainfall stations and contours
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Rainfall totals for a single storm.
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Annual histograms and stats
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Analysis of rain data
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Water Facilitates Chemical Weathering caused by 1. 2 . products of 1 . 2. continued weathering 1. 2. 3.
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Chemical Weathering
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Chemical weathering at the surface
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Chemical weathering throughout
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Chemical Weathering caused by 1. 2 . products of 1 . 2. continued weathering 1. 2. 3.
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Saprolite: Weathered bedrock with a relic rock structure
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Products of Chemical Weathering 1. Ions from dissolved rock and minerals (these ions help support life). 2. Mechanically weaker rock.
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The same weakened rock, except much larger pieces
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How Does Chemical Weathering Occur? During chemical weathering, water, ions and oxygen react with exposed mineral surfaces. Primary minerals + acids + oxygen sediments (rock fragments, secondary minerals) + dissolved ions
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Common Chemical Weathering Reactions Formation of carbonic acid Dissolution of calcite Dissolution of silicate minerals Oxidation of pyrite
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Formation of Carbonic Acid H 2 O + CO 2 H + + (HCO 3 - ) H 2 CO 3 water carbon hydrogen bicarbonate carbonic dioxide ion ion acid
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Dissolution of Calcite CaCO 3 + H 2 CO 3 Ca + 2 + 2(HCO 3 ) - calcium carbonic calcium bicarbonate carbonate acid ion ion
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Hydrolysis 2NaAlSi 3 O 8 + 2H 2 CO 3 + 9H 2 0 sodium carbonic water feldspar acid 2 Na + + 2(H 2 CO 3 ) - + 4H 4 SiO 4 + Al 2 Si 2 O 5 (OH) 4 sodium bicarbonate silicic kaolinite ion ion acid
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Oxidation of Pyrite 4FeS 2 + 15O 2 + 8H 2 0 2Fe 2 O 3 + 8H 2 SO 4 pyrite oxygen water hematite sulfuric acid
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Increasing time Of course, both physical and chemical processes act together to disintegrate rock.
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This note was uploaded on 06/03/2011 for the course GEOL 315 taught by Professor Torres during the Spring '11 term at South Carolina.

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Lectures Part 2 - SC Coast Monthly Average Tipping bucket...

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