Special activity in celebration of Earth Day.

When you look at a river, what can you see? What can’t you see? And what does this mean for river health?

You may think water clarity or presence of fauna tell us how healthy a waterway is, but a strong clue is actually buried in the sediment, where nymph and larval stages of insects live. How do the presence or absence of macroinvertebrates help scientists determine if a river is healthy? How does pollution affect macroinvertebrates? Find out in this Explore-It Kit!