BrainPOP offers free online movies on topics related to Earth Day throughout the month of April.

The movie titles include Earth (April 1-9), Global Warming (April 10-16), Recycling (April 17-23) and Earth's Atmosphere (April 24-30).

To view the films, go to http://www.brainpop.com/ and click on the featured movie.

Source: BrainPOP, http://www.brainpop.com/.