The Water Cycle

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The Water Cycle

• What is it and how does it work?

2
Did you know?

• Water covers 70 of the Earths surface
• 97 of the water on earth is salt water which
  cannot be directly consumed by humans
• 2 of the water on earth is frozen solid
• 1 of the water on earth is drinkable

3
The Water Cycle Answers!
Condensation
Water Vapor
Precipitation
Evaporation
Percolation/Infiltration
Water
Run off
4
The water cycle begins with water. Water is found
in many places. A few of them are as follows
Lakes, rivers, oceans, ponds, puddles,
reservoirs, and many other places.
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• The next stage is evaporation.
• This is a process where the water is heated and
  turned into a water vapor.
• The sun is the main heat source this process.

6

• The next stage is condensation.
• This is where warm and cold air collide and form
  ice crystals that condense and form droplets of
  water.
• These water droplets eventually become to heavy
  and begin to fall in the form of precipation.

7

• The next stage is precipitation.
• This is water falling to the earth in the form of
  snow, hail, rain, or sleet.

8

• The next stage is percolation or infiltration.
• The water seeps through the soil and ends up in
  the water table.
• It then flows into the streams, lakes, oceans,
  and other bodies of water. The process is then
  repeated again and again.

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To Sum it all up

• With transpiration and evaporation, the cycle
  begins again EVAPORATION, CONDENSATION,
  PRECIPITATION, RUN-OFF, INFILTRATION/PERCOLATION,
  and TRANSPIRATION.
• Each time a molecule of water goes through the
  cycle it is cleaned or purified, so it can be
  used by plants and animals again tomorrow, next
  year, and hopefully forever.

10
Modifying the water cycle

• Humans constantly pull water out of the cycle to
  use.
• Much of this water is polluted and must be
  cleaned before use. Can you think of ways that
  you use water?

11
Pollution

• Can you identify which of the following could be
  harmful to our environment? Be prepared to
  explain your answer, how it relates to the water
  cycle, and what you can do to reduce the
  pollution.
• Oil spills
• Litter
• Soaps
• Pesticides
• Fertilizers
• Industrial chemicals