Appropriate grades or age groups:
Elementary School
Middle School
High School & Beyond

Estimated time to complete activity:
about 10 to 20 minutes

Description of Earth Day activity:
You get to see how much you know about the Earth through a variety of on-line quizzes. The information is really fascinating and informative. Here's an example of a question from one quiz:

If you had a job that put you in charge of saving all species on the edge of extinction in the United States, about how many endangered species would you need to save (based on what we know today)?

The answer? 1,082. This is a great source for anyone young or old to learn about the world we inhabit. Link to Fun Stuff to test your Earth IQ.