Chapter 2:1 Views of Earth- Landforms


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Chapter 2:1 Views of Earth- Landforms

  1. 2. Chapter: Views of Earth Table of Contents Section 3: Maps Section 1: Landforms Section 2: Viewpoints
  2. 3. <ul><li>The three basic types of landforms are plains, plateaus, and mountains. </li></ul>Landforms Landforms 1
  3. 4. <ul><li>Plains are large, flat areas, often found in the interior regions of continents. </li></ul>Plains Landforms 1 <ul><li>Plains often have thick, fertile soils </li></ul>and abundant, grassy meadows suitable for grazing animals.
  4. 5. Plains Landforms 1 <ul><li>Plains also are home to a variety of wildlife, including foxes, ground squirrels, and snakes. </li></ul><ul><li>When plains are </li></ul>found near the ocean, they’re called coastal plains.
  5. 6. <ul><li>A coastal plain is often called a lowland because it is lower in elevation, or distance above sea level, than the land around it. </li></ul>Coastal Plains Landforms 1
  6. 7. <ul><li>The Atlantic Coastal Plain is a good example of this type of landform. </li></ul>Coastal Plains Landforms 1 <ul><li>This area has low rolling hills, swamps, and marshes. </li></ul>
  7. 8. Coastal Plains Landforms 1
  8. 9. <ul><li>The Atlantic Coastal Plain began forming about 70 million years ago as sediment began accumulating on the ocean floor. </li></ul>Coastal Plains Landforms 1 <ul><li>Sea level eventually dropped, and the seafloor was exposed. </li></ul><ul><li>The costal plain is the result of sedimentation. </li></ul><ul><li>As a result, the coastal plain was born. </li></ul>
  9. 10. <ul><li>The central portion of the United States is comprised largely of interior plains. </li></ul>Interior Plains Landforms 1 <ul><li>A large part of the interior plains is known as the Great Plains. </li></ul><ul><li>It is a flat, grassy, dry area with few trees. </li></ul><ul><li>The Great Plains consist of nearly horizontal layers of sedimentary rocks. </li></ul>
  10. 11. <ul><li>Plateaus are flat, raised areas of land made up of nearly horizontal rocks that have been uplifted by forces within Earth. </li></ul>Plateaus Landforms 1 <ul><li>They are different from plains in that their edges rise steeply from the land around them. </li></ul>
  11. 12. <ul><li>The world’s highest mountain peak is Mount Everest in the Himalaya — more than 8,800 m above sea level. </li></ul>Mountains Landforms 1 <ul><li>The four main types of mountains are folded, upwarped, fault-blocked, and volcanic. </li></ul>
  12. 13. <ul><li>The Appalachian Mountains and the Rocky Mountains in Canada are comprised of folded rock layers. </li></ul>Folded Mountains Landforms 1 <ul><li>In folded mountains , the rock layers are folded like a rug that has been pushed up against a wall. </li></ul>
  13. 14. Folded Mountains Landforms 1 <ul><li>To form folded mountains, tremendous forces inside Earth squeeze horizontal rock layers, </li></ul>causing them to fold.
  14. 15. <ul><li>The southern Rocky Mountains in Colorado and New Mexico are upwarped mountains. </li></ul>Upwarped Mountains Landforms 1 <ul><li>High peaks and sharp ridges are common to this type of mountain. </li></ul>
  15. 16. Upwarped Mountains Landforms 1 <ul><li>Upwarped mountains form when blocks of </li></ul>Earth’s crust are pushed up by forces inside Earth.
  16. 17. Fault-Block Mountains Landforms 1 <ul><li>Fault-block mountains are made of huge, </li></ul>tilted blocks of rock that are separated from surrounding rock by faults.
  17. 18. <ul><li>These faults are large fractures in rock along which mostly vertical movement has occurred. </li></ul>Fault-Block Mountains Landforms 1 <ul><li>When these mountains formed, one block was pushed up, while the adjacent block dropped down. </li></ul><ul><li>This mountain-building process produces majestic peaks and steep slopes. </li></ul>
  18. 19. Volcanic Mountains Landforms 1 <ul><li>The deposited materials pile up, layer upon layer, until a cone-shaped structure forms. </li></ul><ul><li>Volcanic mountains begin to form when molten material reaches the surface through a weak area of the </li></ul>crust .
  19. 20. Section Check 1 Question 1 ________ are flat, raised areas of land with horizontal rocks that were uplifted. A. Coastal plains B. Interior plains C. Mountains D. Plateaus NC: 5.01, 5.03
  20. 21. 1 Section Check Answer The answer is D. Plateaus are found at higher elevations than plains. NC: 5.01, 5.03
  21. 22. Section Check 1 Question 2 When molten material reaches Earth’s surface through a weak area, _______ mountains begin to form. A. fault-block B. folded C. upwarped D. volcani c NC: 5.01, 5.03
  22. 23. 1 Section Check Answer The answer is D. Mount St. Helens and Mount Shasta are volcanic mountains. NC: 5.01, 5.03
  23. 24. Section Check 1 Question 3 Describe the difference between the formation of folded mountains and fault-block mountains. NC: 5.01, 5.03
  24. 25. 1 Section Check Answer Folded mountains form when rock layers are squeezed from opposite sides. NC: 5.01, 5.03
  25. 26. 1 Section Check Answer Fault-block mountains form when some rock blocks move up along a fracture and an adjacent block moves down. NC: 5.01, 5.03