Earn $5.00 on each sale of Earth Science, a multimedia CD-ROM that helps users explore our Earth system. The CD-ROM includes clouds, earthquakes, forests, global warming, great lakes, the ocean, ozone, polar ice, volcanoes, and wetlands. Great for students, teachers, and as a reference for anyone! If you drive a visitor to our site, you earn $5.00 if the visitor buys within 90 days. We also offer a second tier rate of 10%.