Write a 10- to 20-slide Power Point Presentation on the environmental toxicology of one element of LEAD (Pb). My idea is that you should be able to research a lot of this material as you work through the homework assignment throughout the session. Your choice of contaminants is: Arsenic (As) Cadmium (Cd) Chromium (Cr) Copper (Cu) Lead (Pb) Mercury (Hg) Nickel (Ni) Selenium (Se) Zinc (Zn) Asbestos DDT or other organic contaminant This selection of contaminants offers a variety of environmental toxicological effects. Some act as nutrients for humans and other mammals at certain levels, but become toxic at higher levels, whereas others have no nutritional value. Some are highly toxic to aquatic organisms (fish and invertebrates), but less toxic to terrestrial organisms. The toxicity of some of these elements is higher when ingested as particulates as opposed to being consumed through drinking water. Some of these elements bioaccumulate in food webs, eventually making their way to humans. Collectively, these elements have range of chemical behaviors: some are insoluble at low pH, whereas others are less soluble at high pH. The Slide Pesentation should be organized in the style of a scientific presentation. It should have the following sections: Introduction: Defines the purpose of the presentation. It should also include the high points of the chemical nature of the element (atomic number, valence states, etc.). Also, report what the abundance of the element is in the Earth’s crust and in seawater. Uses: Describe the uses of your element. In addition to the textbook, you may also find useful information from the USGS Minerals Information Team (http://minerals.usgs.gov/minerals/index.html). Find your element under “Commodities”. Environmental Guidelines: Summarize environmental guidelines for the elements in drinking water, soil (residential and industrial), stream sediment, and for acute and chronic toxicity to aquatic organisms. Note: there may not be guidelines for all elements in all media. Pathways of Environmental Impact: Describe pathways for that the element can affect humans, and aquatic organisms. Are there key chemical transformations that affect the degree of impact? What are they? Case Study: Describe at least one case study that highlights the environmental toxicology of your element to humans, aquatic organisms, or other wildlife Conclusion: Summarize your major findings in a slide or two. References: You must cite all of your sources of information.