<p>
	In the<a href="http://participatoryscience.org/mercury-watersheds/introduction-mercury-environment"> Introductory Unit </a>we introduced students to mercury. They learned that it is toxic and they should, also, have at least a rough idea of the kinds of quantities that we might expect to find in human hair and in fish. They should also have a general familiarity with the way that mercury, in its different forms, moves through the environment; more specifically they should think about how it moves through their study site and organisms. Students using the activities in this unit will <a href="http://participatoryscience.org/mercury-watersheds/essential-activity-where-mercury-our-study-site-and-how-does-it-move">diagram the mercury cycle</a>- as it pertains to their research site, and can develop a general <a href="http://participatoryscience.org/mercury-watersheds/optional-activity-toxicology-and-living-systems">understanding of toxicology</a> and can play the <a href="http://participatoryscience.org/mercury-watersheds/optional-activity-food-chain-game">Food Chain Game</a>.</p>
