1. The Water Cycle is a continuous movement of water from the Earth

1
Review 12 The Earths Water

• 1. The Water Cycle is a continuous movement of
  water from the Earths surface to the air and
  back to the surface.

2
Review 12 The Earths Water

• 2. Hydrosphere all of the Earths water found
  underground, on the surface and in the air.
• 3. Atmosphere the layers of air that surround
  the Earth.

4. Water vapor the gas form of water
3
6. Condensation the process in which something
changes from a gas to a liquid.
5. Evaporation to change from a liquid to a
gas.
4
Review 12 The Earths Water
7. Precipitation water that falls from the
clouds to the Earth can be rain, hail or snow
5

• Condensation

Evaporation
Precipitation
Runoff
Water
Water Vapor
6
Review 12 The Earths Water
75 of the Earths surface is covered in
water. 97 is undrinkable salt water. 2 is
trapped in ice and glaciers. That leaves only
1 of Earths water available for us to drink!
This water is found in lakes, wetlands, rivers,
and underground.
7
Review 12 The Earths Water

• When the water vapor condenses in the air and
  falls to ground as precipitation, it can form
  runoff. Runoff is water thats not absorbed into
  the Earth, but runs back into a body of water.
• Groundwater is the water that absorbs into the
  ground.
• This water can collect underground in layers of
  rock, gravel, or sand to form aquifers.
• A human body is about 65 water. How old do you
  think this water is? Why?

8
Review 12 The Earths Water

• As runoff collects into larger bodies of water,
  it makes different types of water systems.
• The lotic system is a water system where water
  is in motion (moving). The movement of the water
  is caused by changes in the land.
• The lentic system is a water system where water
  is not in motion. Lakes and ponds are examples.
• What are some of the differences in
• ecosystems of lotic and lentic water systems?

9
Review 12 The Earths Water

• When multiple lotic (moving) water systems
  collect into larger bodies of water, the result
  is a watershed.
• Watersheds are important because they transport
  water to places that might not receive much
  rainfall.
• Wastewater from homes and storm sewers, along
  with chemicals and garbage can drain into and
  pollute your local watershed.
• Click here to take a road trip with a raindrop
  through a watershed.
• What is your local watershed called?
• Where does your community get its water?
• Click here to find out.