پاورپوینت در مورد EARTH MATERIALS VI - دانلود رایگان
دانلود رایگان
دانلود رایگان لینک دانلود و خرید پایین توضیحاتدسته بندی : پاورپوینتنوع فایل : powerpoint (..ppt) ( قابل ويرايش و آماده پرينت )تعداد اسلاید : 25 اسلاید قسمتی از متن powerpoint (..ppt) : EARTH MATERIALS VI The Rock Cycle: Clastic Sedimentary Rocks THE ROCK CYCLE Relative proportions of rock groups Sedimentary rocks: larger proportion of land surface The greater proportion created by weathering, erosion & deposition These are known as clastic sediments SEDIMENTARY ROCKS Clastic sediments from weathering & erosion of pre- existing rocks Weathering can be physical (freeze-thaw) or chemical Erosion & subsequent transportatio n by water , wind and ice before deposition Biogenic and chemical sediments form as biochemical or inorganic chemical precipitates E.g. shelly fragments in limestones; evaporites