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Unit 1, lesson 2


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Introduction to tectonic plates, glaciers, and erosion for fourth grade

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Unit 1, lesson 2

  1. 1. Land and Water
  2. 2. Major Landforms <ul><li>Many Forces shape the land. </li></ul>Tectonic Plates Glaciers Erosion
  3. 3. Tectonic Plates <ul><li>Are underneath the Earth’s surface. </li></ul><ul><li>Are huge slabs of slowly moving rock. </li></ul><ul><li>Over 50 million years ago, they pushed together and caused rocks to break and move. </li></ul><ul><li>Rocky Mountains and Appalachian Mountains were formed by tectonic plates. </li></ul>
  4. 4. Erosion <ul><li>Erosion is the process of wearing away rock and soil. </li></ul><ul><li>Erosion is caused by water, wind, and glaciers. </li></ul>
  5. 5. Water Erosion <ul><li>Creates deep valleys and canyons. </li></ul><ul><li>Example: The Colorado River carved the Grand Canyon </li></ul>
  6. 6. Wind Erosion <ul><li>Blows sand against rock and wears it away. </li></ul><ul><li>Blows away dry soil when there are few plants to hold down the soil. </li></ul><ul><li>Example: Wind erosion widened the Grand Canyon. </li></ul>
  7. 7. Glacier Erosion <ul><li>Glaciers are huge pieces of slowly moving ice. </li></ul><ul><li>They push soil and rocks as they move. </li></ul><ul><li>They flatten some areas and leave piles in others. </li></ul>Hills Valleys Plains
  8. 8. Bodies of Water <ul><li>Waterways have been formed by glaciers and by the flow of water </li></ul>
  9. 9. Lakes <ul><li>Glaciers scooped out soil and rocks to form basins. </li></ul><ul><ul><li>Basin: an area with a low center surrounded by higher land. </li></ul></ul><ul><li>When glaciers melted, water stayed in the basins. </li></ul>
  10. 10. More About Lakes <ul><li>If water flows faster into low areas than it can leave, lakes can form. </li></ul><ul><li>Some lakes drain water through rivers. </li></ul><ul><li>Some the water seeps into the ground. </li></ul><ul><li>Utah’s Great Salt Lake is very shallow and the water evaporates. </li></ul>
  11. 11. Rivers <ul><li>Rivers form as water moves over land from a high area to a lower area. </li></ul><ul><li>Water flows downhill in creeks and streams. </li></ul><ul><li>Creeks and streams join up with a river, which flows to the nearest ocean. </li></ul><ul><ul><li>Rivers west of the Rocky Mountains flow west instead of south like the Mississippi River does. </li></ul></ul>
  12. 12. More About Rivers <ul><li>The Mississippi River is the 2 nd largest river in North America. </li></ul><ul><li>Earliest settlers settled along rivers. </li></ul><ul><ul><li>Provide water for drinking and farming </li></ul></ul><ul><ul><li>Help people travel and move goods </li></ul></ul><ul><ul><li>Steady flow creates power to run machines </li></ul></ul>
  13. 13. Why It Matters…. <ul><li>Landforms and bodies of water influence how and where we live! </li></ul>