<h2>
	<a name="TOC-OVERVIEW"></a>OVERVIEW</h2>
<p>
	This is the <u>essential</u> activity within Unit 2 and has students visit (or virtually visit) their field site in order to better understand its ecosystem and the food web that exists there.&nbsp; Diagramming these characteristics helps lead to a richer understanding of how mercury is transported in the environment.</p>