Constructive Destructive Forces on Landforms

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Two Types of Forces. Destructive Forces: processes that destroy landforms.2 types: Slow (weathering) and Fast (Erosion)Ex. landslides, volcanic eruptions, earthquakes, floodsConstructive forces: forces that build up an existing landform or create a new one. Caused by: water, gravity, wind and glaciers.Ex: deposition, landslides, volcanic eruptions, floods.
Constructive Destructive Forces on Landforms

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1. Constructive & Destructive Forces on Landforms 5-3.1

2. Two Types of Forces Destructive Forces: processes that destroy landforms. 2 types: Slow (weathering) and Fast (Erosion) Ex. landslides, volcanic eruptions, earthquakes, floods Constructive forces: forces that build up an existing landform or create a new one. Caused by: water, gravity, wind and glaciers. Ex: deposition, landslides, volcanic eruptions, floods

3. Weathering Weathering: a slow, destructive force that breaks rocks into smaller pieces called sediments. Can by physical (mechanical) or chemical. Keywords: wear down, break apart

5. Chemical Weathering: the changing of materials in a rock by chemical processes.

6. Erosion Erosion: the destructive movement of materials away from one place by wind, water, ice and gravity.

7. Landslides Landslides: occur when gravity quickly pulls rock and dirt downhill.

8. Floods Floods: a great flow of water over an area that is usually dry land.

9. Volcanic Eruptions Volcano: an opening in the Earth?s crust through which steam, lava and ashes erupt. Cause both destructive and constructive changes to landforms.

10. Mount St. Helens

12. Earthquakes Earthquakes: the shaking of Earth?s surface caused by the release of energy along a fault.

13. Volcanoes & Earthquakes

14. Erosion & Deposition Deposition: the placing of materials in a new place (constructive force). Ex. Sandbars

15. Water Erosion & Deposition River Delta- Deposits of sediment at the mouth of the Mississippi River creating new land called a delta.

16. Wind Erosion & Deposition Sand Dunes- sand is moved by wind


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