¬†¬†¬†¬† Today, March 22, 2011, is World Water Day, designated by the United Nations.¬†
¬†¬†¬†¬† What better time to pause to consider the wonder of water, how it sustains us and all of life on our blue planet.¬† Here are some interesting facts about water to think about today:
- Water covers about 70% of the earth’s surface.¬† Ours is indeed a watery planet.
- The overall amount of water on our planet has remained the same for about two billion years.
- Water moves around the planet in a water cycle.¬† The cycle has five parts:¬† evaporation, condensation, precipitation, infiltration, and surface run-off.
- 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!
- Groundwater can take a human lifetime just to travel a single mile.
- Water is a key factor in regulating the earth’s temperature.¬†
- Water is the only substance found naturally on the earth in all three states–solid, liquid, and gas.
- Frozen water is 9% lighter than liquid water, which explains why ice floats on water.
- Of all the water on earth, only 2.5% is fresh water.¬† Fresh water is either groundwater or more accessible water in lakes, streams, and rivers.
- The deep ocean current moves around the planet in a 1,000 year cycle, enriching nutrient-depleted surface waters by carrying them through deeper layers where nutrients¬†are abundant.