{"id":3863,"date":"2023-10-06T06:05:57","date_gmt":"2023-10-06T06:05:57","guid":{"rendered":"http:\/\/localhost\/ecole9ja\/?p=3863"},"modified":"2023-10-06T06:10:59","modified_gmt":"2023-10-06T06:10:59","slug":"week-5-ss3-first-term-geography-notes","status":"publish","type":"post","link":"https:\/\/ecolebooks.com\/nigeria\/posts\/week-5-ss3-first-term-geography-notes\/","title":{"rendered":"Week 5 – SS3 First Term Geography Notes"},"content":{"rendered":"

\u00a0WEEK FIVE
\n<\/strong>DENUDATIONAL PROCESSES
\n<\/strong>Denudation is the process of lowering or sculpturing the earth surface by the activities of certain agents called denudation. The word denude is an original Greek word for reduction, that is, lowering or cutting. Therefore, denudation process are processes that contribute to lowering or reshaping the earth.<\/p>\n

\u00a0Types of Denudational Processes
\n<\/strong>Denudation involves four major processes and a fifth, which strictly speaking is not considered as properly belonging to this group. They include;<\/p>\n

    \n
  1. Weathering\n<\/li>\n
  2. Erosion\n<\/li>\n
  3. Transportation\n<\/li>\n
  4. Mass Movement\n<\/li>\n
  5. Deposition\n<\/li>\n<\/ol>\n

    \u00a0<\/p>\n

      \n
    1. \n
      Weathering
      \n<\/strong><\/div>\n

      Weathering has been defined as the decay or decomposition of rock materials in situ. The process of weathering may be physical, chemical or biological.\n<\/li>\n<\/ol>\n

      \u00a0<\/p>\n

        \n
      1. \n
        Erosion
        \n<\/strong><\/div>\n

        Erosion is the removal of weathered materials. It involves the detachment of debris or classic materials (broken material).\n<\/li>\n<\/ol>\n

        \u00a0<\/p>\n

          \n
        1. \n
          Transportation
          \n<\/strong><\/div>\n

          This involves the conveyance of the eroded materials away from the original point’s erosion by transporting agents such as running water, wind, ice, waves and gravity.\n<\/li>\n<\/ol>\n

          \u00a0<\/p>\n

            \n
          1. \n
            Deposition
            \n<\/strong><\/div>\n

            Deposition in its strict sense is not a Denudational process. Rather, it belongs to a process of a gradation instead of degradation.\n<\/li>\n<\/ol>\n

            \u00a0
            \n\u00a0Major concepts of Weathering
            \n<\/strong>The following major concepts are briefly explained below:<\/p>\n

              \n
            1. In situ\n<\/li>\n
            2. Disintegration\n<\/li>\n
            3. Expansion and contraction\n<\/li>\n
            4. Oxidation, carbonation, solution, hydrolysis\n<\/li>\n
            5. Debri\n<\/li>\n
            6. Definition of weather materials based on sources.\n<\/li>\n<\/ol>\n

              In situ: This means on the spot disintegration of materials. This implies that no movement of any kind is involved.<\/p>\n

              \u00a0Disintegration: is the detachment of the materials from the parent body. It means splitting away of the debris or clastic materials. <\/p>\n

              \u00a0Expansion and contraction
              \n<\/strong>This is a physical weathering process which is caused by the action of heating during the day and cooling at night. Daytime heating will produce expansion while night time cooling will imitate contraction. This phenomenon of expansion and contraction is most common in hot desert landscapes where excessive heating during the day would cause expansion while night time radiation will result extreme cooling and contraction of rock surfaces.<\/p>\n

              \u00a0Oxidation<\/strong>: This relates to the effects of atmosphere oxygen on rocks that contain iron materials, the oxidation process acts to reduce the iron material from its ferrous (Fe2<\/sup>) to its ferric ionized state (Fe3<\/sup>). Oxidation or ionization results in the production of reddish surface on materials undergoing the process. Oxidation is commonly screen in the rusting of metals particularly iron.<\/p>\n

              \u00a0Carbonation<\/strong>: Solution and hydrolysis are different process of chemical reaction, which is facilitated by, water action. They shall be treated in detail below.<\/p>\n

              \u00a0Debris:<\/strong> These are weathered materials which come in different shapes. They may be called regolith, or elastic materials.<\/p>\n

              \u00a0Definition of weather materials by source
              \n<\/strong><\/p>\n

                \n
              1. Aeolian deposits \u2013 wind derived materials.\n<\/li>\n
              2. Marine deposits \u2013 from sources in the ocean\n<\/li>\n
              3. Lacustrine materials \u2013 from lake source\n<\/li>\n
              4. Fluvial materials \u2013from source in rivers\n<\/li>\n
              5. Fluvial glacial \u2013 derived from valley glaciers\n<\/li>\n
              6. Glacial deposits \u2013 from sources of glaciations\n<\/li>\n
              7. Volcanic deposits \u2013 from volcanic sources.\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

                \u00a0WEEK FIVE DENUDATIONAL PROCESSES Denudation is the process of lowering or sculpturing the earth surface…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,300],"tags":[],"class_list":["post-3863","post","type-post","status-publish","format-standard","hentry","category-posts","category-first-term-ss3-geography"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3863","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/comments?post=3863"}],"version-history":[{"count":1,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3863\/revisions"}],"predecessor-version":[{"id":3864,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3863\/revisions\/3864"}],"wp:attachment":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/media?parent=3863"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/categories?post=3863"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/tags?post=3863"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}