Sedimentary Processes I

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Presentation transcript:

Sedimentary Processes I By: Athena Coleen Sugui

Earth’s External Processes Weathering Weathering Mechanical Mass Wasting Chemical Erosion

Mechanical Weathering Big rocks, broken down into little pieces Frost wedging Salt Crystal Growth Sheeting Biological Activities

What is Frost Wedging? Salt Crystal Growth -known as Haloclasty -disintegration of rocks -leaves salt crystals What is Frost Wedging? Expands, Contracts, Breaks Hot days, Cold nights

Sheeting and Exfoliation -Peeling off in Sheets -Pressure-release jointing -Thin layers Sheeting and Exfoliation

Biological Weathering

Water and Carbonic Acid Chemical Weathering Water and Carbonic Acid Hydrolysis -CO2 reacts with water =Carbonic acid -Attacks different kind of rocks -leaves pockets(caves) Spheroidal Weathering Weathering of Granite

Hydrolysis -silicate minerals; altered by the process Hydrolysis -compound reacts with water (forming one or two substances); -Rock forming minerals;

Spheroidal Weathering and Granite Weathering -crumbled; -Concentric shells of decayed rock (most are granite); -loosened or separated; -edges are rounded; -Jointed;

Factors that Affect the Rate of Weathering Climate - warmer temperature speeds up chemical reactions - water allows molecules to move faster Rock Composition – harder rocks (slower rate) - soft rocks (faster rate) Surface Area – rocks exposed (increases rate) - less surface area (slower rate)

References www.sepmstrata.org/page.aspx?pageid=680 www.studyblue.com www.earthscienceworld.org/images/search/results.html?Keyword=Spheroid www.columbia.edu/~vjd1/weathering.htm www.science.jrank.org/pages/7356/Weathering-Chemical-Weathering.html www.geology4kids.com www. Estes.on-line.com/rmnp/articles/frstwdg.html www.kwaad.net/Salt-Weathering.html www.geology.about.com www.studyblue.com http://www.kwaad.net/Salt-weathering.html zschierlphotography.com www.eschooltoday.com teach.albion.edu www.rymich.com www.flickriver.com www.youtube.com www.geocaching.com geology.about.com Geology4kids.com www.passmyexams.co.uk home.portervillecollege.edu blogs.yis.ac.jp