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Constructive and deconstructive

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SC 5th Grade Standards; Effects on Earths Geological Landforms

SC 5th Grade Standards; Effects on Earths Geological Landforms

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  • 1. Constructive and Deconstructive Explain how natural processes (including weathering, erosion, deposition, landslides, volcanic eruptions, earthquakes, and floods) affect Earth’s oceans and land in constructive and deconstructive ways.
  • 2. Constructive
    • Processes that create landforms
      • Deposition
      • Landslides
      • Volcanic eruptions
      • Floods
    Destructive
    • Processes that destroy landforms
      • Weathering
      • Erosion
      • Landslides
      • Volcanic eruptions
      • Earthquakes
      • floods
  • 3. Weathering
    • Weathering is a general term used to describe processes that break down rocks at or near the surface of the earth
    • Weathering can be either physical or chemical
    • These processes cause the surface of the earth to dissolve , decompose , and break into pieces.
  • 4. What Causes Weathering
    • Water is an important cause of weathering
    • Plants cause weathering when roots break apart rock.
    • Changes in temperature can break rock as well as ice forming inside cracked surfaces causing it to break apart even more.
    • Anything that causes rock to wear down or break apart is a cause of weathering .
  • 5. Erosion
    • Erosion is the movement of sediments and soil by wind , water , ice and gravity .
  • 6. Deposition
    • Deposition is the dropping, or depositing of sediment by water, wind or ice.
    • Deposition builds up new land on Earth’s surface, like a delta at the end of a river or the pile up of a sand dune in the desert .
    • Shells on the beach are deposition by the ocean waves .
  • 7. Landslides
    • Landslides are mass movements of land due to gravity
    • Landslides can cause buildings to fall, or power and gas lines to break.
    • Landslides even occur on the continental slope in the ocean.
  • 8. Volcanic Eruptions
    • Volcanoes are mountains with an opening in the Earth's crust through which magma , gases , and ash reach Earth’s surface.
    • Volcanoes can change Earth’s surface.
    • When the magma erupts from the volcano the top of the mountain can be changed, either built up or exploded off .
    • The lava and ash can destroy forests and bury fields.
  • 9.
    • Volcanic eruptions can even change Earth’s weather patterns
    • Volcanic eruptions also occur under the oceans ; these volcanoes that built up are called seamounts.
    • If a seamount rises above the ocean surface it is called a volcanic island (for example Hawaii and Japan)
  • 10. Earthquakes
    • Earthquakes are vibrations on Earth’s surface caused by sudden movement in Earth, often along a fault , a break in the Earth’s surface.
    • Some earthquakes cause little damage and some cause a lot of damage.
  • 11.
    • Large earthquakes can cause landslides
    • Earthquakes under the ocean can cause huge waves, called tsunamis that destroy land, causing great damage if they come ashore.
  • 12. Floods
    • Floods occur when a large amount of water covers land that is usually dry .
    • When the flood occurs, rapid erosion can take place and move soil and sediments away .
    • When the flood recedes, new sediment is left behind and can build up rich soil deposits.
  • 13. Test Preparation
    • Define:
      • Deposition- this is the dropping of sediment by wind, water, or ice.
      • Constructive- this type of force creates landforms
      • Weathering- this is the movement of sediment by wind, water and gravity
      • Landslide- this type of movement of land is caused by gravity
      • Destructive- this type of force destroys landforms
      • Erosion- this is a type of process that breaks down landforms
    • Ocean waves cause erosion when crashing up against rock surfaces, therefore causing the side of the rock or mountain to decrease in size.
  • 14.
    • What contributes to physical weathering?
      • Growing plants
      • Flowing water
      • Freezing water
    • A river overflows its banks due to excessive rains and floods the surrounding land. After the rain stops, the water returns to the river’s original path. However, the land surrounding land is now covered with a new soil. This is an example of deposition of sediment – constructive force.
    • Tsunamis are caused by underwater earthquakes .
    • What is one example of deposition?
      • Wind building up sand dunes
  • 15.
    • A fast moving stream deposits what type of material first?
      • gravel
    • How does freezing of water cause weathering of rocks?
      • It cracks them .
    • How can a volcanic eruption be both constructive and destructive?
      • The lava and ash from volcanic eruptions can destroy forests and bury fields. The magma and lava can form new tops of the volcanic mountains or build up the land around the volcano. For example, a volcano under the sea, a seamount, erupts and erupts and erupts, building new land. This repeating eruption creates islands such as Hawaii and Japan.
  • 16. 5-3.2
    • How is the abyssal plan different from the ocean basin?
      • The abyssal plain is flatter
    • If you are playing in the sand at the beach, on what oceanic landform are you playing?
      • Continental shelf
    • What are the indentations at the top of the mid-ocean ridge called?
      • Rift valley
  • 17.
    • Sound waves produced by a sonar can be used by oceanographers to help map the ocean floor. What can you infer from the following data about the ocean floor?
      • Location B is deeper than location A
    1 seconds 5 seconds 10 seconds 3 seconds Time before echo is heard D C B A Location
  • 18. Be able to Label this chart!!
  • 19. Fill in the Missing Landforms Abyssal plain Plains Wide, flat areas of land Mid-ocean Ridge Mountain Land which rises high above the ground seamount Volcano An opening in the surface where lava may flow trench Canyon Deep Valley with high steep sides Rift Valley Low land between hills or mountains Oceanic Continental Descriptions Continental and Oceanic Landforms