Our earth


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This presentation describes the condition of our changing earth

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Our earth

  1. 1. OUR CHANGING EARTH Click to start By- Animesh Agarwal. Made by-Animesh Agarwal [email_address]
  2. 2. <ul><li>Lithospheric plates  are the plates that comprise the fractured surface of the earth. </li></ul><ul><li>Lithospheric plates are of two types: </li></ul><ul><li>1. continental plates </li></ul><ul><li>2.oceanic plates . </li></ul><ul><li>Earthquake and volcanic activity is common along the boundaries of Lithospheric plates. </li></ul>
  3. 3. EARTH MOVEMENTS <ul><li>The earth movements are divided on the basis of forces. </li></ul><ul><li>Endogenic forces. </li></ul><ul><li>Exogenic forces </li></ul>
  4. 4. Endogenic  or  endogenous   <ul><li>  The term Endogenic refers to internal processes and phenomena that occur beneath the earth's surface - or any other celestial body. </li></ul><ul><li>earthquakes and volcanoes are all endogenic processes. </li></ul>
  5. 5. Volcano <ul><li>A  volcano  is an opening, or rupture, in a planet's surface or crust, which allows hot, molten rock, ash, and gases to escape from below the surface </li></ul><ul><li>The word  volcano  is derived from Italian  volcano , after Vulcan, the Roman god of fire. </li></ul>
  6. 7. Earthquake <ul><li>An  earthquake  (also known as a  tremor  or  temblor ) is the result of a sudden release of energy in the Earth's crust that creates seismic waves. Earthquakes are recorded with a seismometer, also known as a seismograph. </li></ul>
  7. 9. Exogenic  or  exogenous <ul><li>Exogenic  refers to external processes and phenomena that occur on or above the Earth's surface. </li></ul><ul><li>Weathering effects and erosion are exogenic processes. </li></ul>
  8. 10. Weathering <ul><li>Weathering  is the decomposition of Earth rocks, soils and minerals through direct contact with the planet's atmosphere. </li></ul>
  9. 11. Erosion <ul><li>Erosion  is the removal of solids (sediment, soil, rock and other particles) in the natural environment. It usually occurs due to transport by wind, water, or ice. </li></ul>
  10. 12. Waterfall <ul><li>A  waterfall  is a place where flowing water rapidly drops in elevation as it flows over a steep region or a cliff. </li></ul>
  11. 13. How is a waterfall formed
  12. 14. Features made by a river. <ul><li>The following features are made by a river- </li></ul><ul><li>Meanders </li></ul><ul><li>Ox-bow lake </li></ul><ul><li>Floodplain </li></ul><ul><li>Levees </li></ul><ul><li>Delta </li></ul>
  13. 15. meanders <ul><li>A  meander  in general is a bend in a sinuous watercourse. </li></ul><ul><li>A meander is formed when the moving water in a river erodes the outer banks and widens its valley.  </li></ul>
  14. 16. meanders
  15. 17. Ox-bow lake <ul><li>An  oxbow lake  is a U-shaped body of water formed when a wide meander from the main stem of a river is cut off to create a lake. </li></ul><ul><li>This landform  is called an oxbow lake for the distinctive curved shape that results from this process. </li></ul>
  16. 19. Flood plain <ul><li>A  floodplain , or  flood plain , is flat or nearly flat land adjacent to a stream or river that experiences occasional or periodic flooding. </li></ul>
  17. 21. Levees <ul><li>A  levee ,  levée ,  dike  (or  dyke ),  embankment ,  flood bank  or  stop bank  is a natural or artificial slope or wall to regulate water levels. It is usually earthen and often parallel to the course of a river or the coast. </li></ul>
  18. 23. Delta <ul><li>A  delta  is a landform that is created at the mouth of a river where that river flows into an ocean, sea, estuary, lake, reservoir, flat arid area, or another river. Deltas are formed from the deposition of the sediment carried by the river as the flow leaves the mouth of the river. </li></ul>
  19. 25. Features made by sea waves <ul><li>The features are- </li></ul><ul><li>Sea caves </li></ul><ul><li>Sea arches </li></ul><ul><li>Stack </li></ul><ul><li>Sea cliff </li></ul>
  20. 26. Sea caves <ul><li>A  sea cave , also known as a  littoral cave , is a type of cave formed primarily by the wave action of the sea. </li></ul><ul><li>The primary process involved is erosion. </li></ul>
  21. 27. Sea arches A sea arch is a natural arch or bridge made of stone that has been created through the process of land, wind, or water erosion.
  22. 28. Stack <ul><li>A  stack  is a geological landform consisting of a steep and often vertical column or columns of rock in the sea near a coast. </li></ul><ul><li>Stacks are formed when part of a headland is eroded by hydraulic action, which is the force of the sea or water crashing against the rock. </li></ul>
  23. 29. Sea cliff <ul><li>The sea water coast rising almost vertically above the sea water is called a sea cliff. </li></ul>
  24. 30. Features of ice <ul><li>These are the following- </li></ul><ul><li>Glaciers </li></ul><ul><li>Glacial monaries </li></ul>
  25. 31. Glacier <ul><li>A  glacier  is a large mass of ice moving slowly over some land surface or down a valley, formed over long periods from the accumulation of snow in areas where the amount of snow that falls exceeds the amount that melts. </li></ul>
  26. 32. Glacial moranies A  moraine  is any glacially formed accumulation of unconsolidated glacial debris (soil and rock) which can occur in currently glaciated and formerly glaciated regions, such as those areas acted upon by a past ice age.
  27. 33. Features made by wind <ul><li>These are the features- </li></ul><ul><li>Mushroom rocks </li></ul><ul><li>Sand dunes </li></ul><ul><li>Loess </li></ul>
  28. 34. Mushroom rocks <ul><li>Mushroom rocks , also called  Rock pedestals , are one of the most striking manifestations of the processes of erosion and weathering. </li></ul><ul><li>Usually found in desert areas.. </li></ul>
  29. 35. Sand dunes <ul><li>Dunes are subject to different forms and sizes based on their interaction with the wind. </li></ul><ul><li>Most kinds of dune are longer on the windward side where the sand is pushed up the dune, and a shorter &quot;slip face&quot; in the lee of the wind. </li></ul>
  30. 36. loess <ul><li>Loess is a geologic term that refers to deposits of silt (sediment with particles 2-64 microns in diameter) that have been laid down by wind action. </li></ul><ul><li>When the wind slowed, the silt would fall out and blanket the area. Frequently the resulting loess deposits are several meters thick (tens of feet). </li></ul>
  31. 37. <ul><li>By- </li></ul><ul><li>Animesh Agarwal </li></ul><ul><li>Hope you like the presentation </li></ul>