Getting
Started
What To Do
All of the Activities
Where To Go
About the Outdoors
Regions
Wildlife
How to Get There
What To Bring
Clothing
Equipment
Food and Water
Costs
Other Things
When To Go
Weather
Seasons
Crowds
Special Events
New This Month
Health and Safety
Conditioning
First Aid
Natural Dangers
Health Benefits
The Environment
Pollution
Preservation
Puzzles
Organizations
Glossary
e-mail
*A little acorn grows
into a big tree:
Click on these for
more information
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Air

Clouds

Light Shows

Ice Age

Troposphere

Weather
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All of the air on the earth weighs about 5,000,000,000,000,000 tons/metric tons.
That's 5 quadrillion tons! Anything that big has to have a lot of things
going on...
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