In this activity, students investigate the effects of automobile pollution on plant growth by making measurements on two populations of leaves, one from within 10 meters of a busy road and a population of the same species situated more than 20 meters away. They will choose a method for measuring the leaves, create a table for their data, and test their hypotheses by performing a t-test. Full description.

This site contains slide shows and virtual field trips of Yellowstone National Park. There are several slide shows to chose from, including wolves of Yellowstone, bear research, fire ecology, the history of Yellowstone and the influence of art on Yellowstone Park. Each program features slides containing text and photographs. There is also an orientation slide show about the National Park system. More ... Full description.