lesson 7

• Bolide Impact

  • The impact of an extraterrestrial body on the surface of the earth
• Asteroid

  • Large
  • Stony or Metallic
  • Larger than Meteoroid
• Meteoroid

  • Smaller than Asteroid
  • Stony
  • Iron Chunk
• Comet

  • Smallest
  • Ice, Dust, and Rock fragments
  • Usually, it has a tail
• Ground Subsidence

  • gradual settling or sudden sinking of the Earth's surface owing to subsurface movement of earth materials.
• Coastal Erosion

  • IT IS a natural process which shapes shorelines by the wearing away of coastal land or beaches, mainly by the impact of waves along the shoreline. 
• Natural Causes

  • Waves
  • Currents
  • Tides
  • Wind-driven water
  • Ice
  • Rainwater
  • Groundwater
  • Wind
• Man-Made Causes

  • Removal of vegetation 
  • Concentration of drainage water flow into the sea 
  • Construction of structure along the shore
  • Building activities that damage natural protective features
  • Shipping and boating activities