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    Ss Chapter 19.1 Ss Chapter 19.1 Presentation Transcript

    • Chapter 19 Earth Cycles and Processes GEE Science Summer Remediation Mr. Nash Donnie Bickham Middle School Room 204
    • Earth Recycles the Elements
      • Earth recycles atoms and compounds over and over in a closed system.
      • Closed system is composed of four parts:
        • Atmosphere
        • Hydrosphere
        • Biosphere
        • Lithosphere
      Pg. 324
    • Earth Recycles the Elements
      • All four spheres depend on each other and interact closely.
      • Changes in the rates of recycling in one of the four parts affects each sphere.
      • If each sphere operates naturally, the health of each is maintained.
      Pg. 324
    • Earth Recycles the Elements
      • If a pollutant is introduced into one sphere, all other areas will be affected as well.
      • Pollutants can be naturally occurring like the debris from a volcano or an increase in salt content because of evaporation.
      • Pollution is also the result of human activities.
      Pg. 324
    • Atmosphere
      • Mixture of gases surrounding the earth.
      • Believed that this mixture has changed as earth has evolved.
      • Heat from the surface warms air close to the earth, causing air to rise.
      • Cooler air rushes in to fill the empty area creating wind.
      Pg. 325
    • Atmosphere
      • Winds accelerate the evaporation of water.
      • Winds can move atmospheric gases as well as small solid particles from one place to another.
      Pg. 325
    • Hydrosphere
      • The hydrosphere is all water environments of earth.
      • This includes oceans and all water situated on the land surface and below ground.
      • As water flows it moves large volumes of minerals.
      Pg. 325
    • Hydrosphere
      • Often rock and sediment are transported thousands of miles.
      • Where the atmosphere and the hydrosphere meet, gases in each sphere transfer to the other if conditions are right.
      Pg. 325
    • The Water Cycle
      • Circulates freshwater between the atmosphere and the earth.
      • 95 % of all water on earth is salt water.
        • Most freshwater is in the form of glaciers.
      • Freshwater is vital for carrying out metabolic processes and is replenished by the water cycle.
      Pg. 325
    • The Water Cycle
      • Precipitation in the form of rain, ice, snow, hail, or dew falls to the earth and ends up in lakes rivers, and oceans through the precipitation itself or through runoff.
      • Evaporation occurs from bodies of water sending water vapor into the atmosphere.
      Pg. 325
    • The Water Cycle
      • Respiration from humans and animals and transpiration from plants also send water vapor into the atmosphere.
      • The water vapor cools to form clouds. The clouds cool and become saturated to form precipitation again.
      Pg. 325
    • The Water Cycle
      • Without the water cycle of evaporation, precipitation, and runoff, a freshwater supply would not be available.
      Pg. 325