Maps 
Navigating the site:
The physical and biological portrait of the USA
The line drawn here is the hundredth meridian.
• Beyond the 100th meridian the amount of rainfall drops to below an amount that can sustain agriculture.
• The arid regions lie between this meridian and the coastal ranges of the Pacific ocean.
After a 600 foot, or 200 meter rise in sea level, this is how the country will look. This happened millions of years (20 million) ago.
Growth areas of the US.
How big is the US?
Weather map of the US showing the size of hurricane Jean, 2004.
What is the vegetation and population of the US like?
