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Water and the Earth
- 80% of the
earth's surface is water.
- 97% of the
earth's water is in the oceans and seas.
- In a 100-year
period, a water molecule spends 98 years in the ocean, 20 months
as ice, about two weeks in lakes and rivers, and less than a week
in the atmosphere.
- Water is
the only substance on earth naturally found in the three rule
element forms: solid, liquid, and gas.
- There is
the same amount of water on Earth now as there was when the Earth
was formed. The water from your faucet could contain molecules
that dinosaurs drank.
Rockville Water Facts
- Average amount
of water produced daily at the Rockville water treatment plant:
5.3 millions gallons per day.
- Average daily
use of water in Rockville: 118 gallons per day per person.
- The
average household uses 107,000 gallons of water per year.
- Water is taken from the Potomac and is pumped seven miles into Rockville.
Evaporation
- Each day the
sun evaporates 1,000,000,000,000 (a trillion) tons of water.
- A full-grown
tree will evaporate about 700 gallons of water per day.
- A single birch
tree will give off 70 gallons of water per day in evaporation.
- An acre of corn will give off 4,000 gallons of water per day in evaporation.
Water and You
- 66% of your
body is water.
- Bones are 25%
water.
- Human blood is 83% water.
- A person can survive without food for more than 30 days, but less than a week without water.
- For every 2.31 feet you are submerged below a body of water's surface there is 1 pound per square inch of pressure equally placed on your body.
How
Much Water?
- It takes
1,851 gallons of water to refine one barrel of crude oil.
- It takes
120 gallons of water to produce one egg.
- More than 42,000 gallons of water (enough to fill a 30x50 foot swimming pool) are needed to grow and prepare food for a typical Thanksgiving dinner for eight.
- A gallon of water weighs 8.34 pounds.