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Unit 1, lesson 2
 

Unit 1, lesson 2

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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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    Unit 1, lesson 2 Unit 1, lesson 2 Presentation Transcript

    • Land and Water
    • Major Landforms
      • Many Forces shape the land.
      Tectonic Plates Erosion Glaciers Erosion Erosion
    • 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.
    • Erosion
      • Erosion is the process of wearing away rock and soil.
      • Erosion is caused by water, wind, and glaciers.
    • Water Erosion
      • Creates deep valleys and canyons.
      • Example: The Colorado River carved the Grand Canyon
    • 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.
    • 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
    • Bodies of Water
      • Waterways have been formed by glaciers and by the flow of water
    • 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.
    • 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.
    • 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.
    • 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
    • Why It Matters….
      • Landforms and bodies of water influence how and where we live!