Sedimentary Processes I By Athena Coleen Sugui Earths

Sedimentary Processes I By: Athena Coleen Sugui

Earth’s External Processes Weathering Mechanical Mass Wasting Chemical Erosion

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

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

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

Biological Weathering

Chemical Weathering Water and Carbonic Acid Hydrolysis -CO 2 reacts with water =Carbonic acid -Attacks different kind of rocks -leaves pockets(caves) Weathering of Granite Spheroidal Weathering

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. studyblue. com http: //www. kwaad. net/Salt-weathering. html zschierlphotography. com www. eschooltoday. com teach. albion. edu www. rymich. com www. flickriver. com www. geocaching. com geology. about. com Geology 4 kids. com www. passmyexams. co. uk home. portervillecollege. edu blogs. yis. ac. jp www. sepmstrata. org/page. aspx? pageid=680 www. earthscienceworld. org/images/search/results. html? Keyword=Spher oid www. columbia. edu/~vjd 1/weathering. htm www. science. jrank. org/pages/7356/Weathering-Chemical. Weathering. html www. geology 4 kids. com www. Estes. on-line. com/rmnp/articles/frstwdg. html www. kwaad. net/Salt-Weathering. html www. geology. about. com www. youtube. com