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4th grade intro to landforms and how they are formed

4th grade intro to landforms and how they are formed

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Transcript

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