Source   http://sat.teachstreet.com/
Related posts:
Breathing Earth! – CO2 emissions simulated in real time
Surface Area Required to Power the World [Infographic]
Major river basins of the world
The Internet in 2020 [Infographic]
10 Hot Jobs for 2011 [Infographic]
Microprocessor Timeline [Infographic]
Evolution of Web Design [Infographic]
Youth Sports Injuries [Infographic]
The Evolution of Communication [Infographic]
The official “stuff” of all 50 states