10'1 Distribution of Water

1
10.1 Distribution of Water

• Water exists everywhere on Earth, and covers 70
  of its surface. 97 of this water is found in the
  oceans.
• Another 2 is ice and snow, leaving only 1 as
  fresh water found in the ground, rivers, lakes
  and streams.
• Finding fresh water to drink is a challenge in
  many places, as most fresh water is under the
  ground.

See page 362
2
The Water Cycle

• Earth is the only planet with water in all 3
  states
• Water is continually cycling through the water
  cycle
• Heat energy from the Sun causes these changes to
  drive the water cycle.

Solid ? Liquid Melting Liquid ? Gas
Evaporation Gas ? Liquid Condensation Liquid ?
Solid Solidify/Freeze Solid ? Gas
Sublimation Gas ? Solid Deposition
See page 364
3
The Water Cycle (continued)

• The water cycle occurs everywhere, not just
  oceans
• Water evaporates when it is warmed, and then
  condenses in the atmosphere as clouds
• when it cools and falls as
• precipitation. The water
• then runs-off back to
• storage basins, or soaks
• into the ground.
• A hydrologist is a scientist who studies water
  systems
• An oceanographer studies oceans specifically

See pages 404 - 405
Take the Section 10.1 Quiz