Water Sources

• Earth's surface is covered by 71% water
• Distribution of water on Earth

  • 97% salt water
  • 2% fresh water in glaciers and ice caps
  • 1% fresh water
• Water cycle


  The movement of water on Earth and in the atmosphere between different states
• The four major steps of the water cycle

  1. Evaporation

  2. Condensation

  3. Precipitation

  4. Collection
• Condensation


  Water changes from a gas back into a liquid, collecting in clouds
• Precipitation


  Water falls back to Earth in the form of rain, hail, sleet and snow
• Collection


  Precipitation collects in oceans, lakes, rivers and streams, and soaks into the ground as groundwater
• Evaporation


  Water is heated by the sun, changing it from a liquid to a gas (water vapor)
• The water cycle is important because it moves nutrients around and provides plants, animals and humans with water
• Bodies of water

  • Ocean
  • Sea
  • Waterfalls
  • Lake
  • River
  • Bay
• Clean water changes absolutely everything - it can improve health, access to food, local economic growth, and education
• 663 million people in the world live without clean water
• 783 million people do not have access to clean and safe drinking water globally