Leachate- from landfills and groundwater

Well I am studying for my groundwater and soil class, and came across a section in my textbook that is not explained very well. It talks about leachate from landfills, but does not go in depth about what it is, and it's effects on groundwater. Since I am studying for my finals now, time is of the essence... can anyone explain to me what leachate from landfills is why is it important, and it's effects on groundwater. Its explanation in the textbook is quite brief, and not very useful.

Cairo Egypt

I am researching the city cairo, egypt on their school system and if any crime/drugs/gangs. Thanks for your help

Disturbances in Chemical Cycles

Deforestation is cited as one example of a disturbance in the carbon cycle. Give and describe other examples of a disturbance in other chemical cycles.

Global population and Neo-malthusians

Outline your perspective on global population issues and your alignment with neo-Malthusians or neoclassical economists. Consider and respond to the following questions: • Where do you believe the world stands in terms of global population? • Is the current global population exhausting the Earth's carrying capacity or will market forces driving new technologies allow for continuous growth of the Earth's carrying capacity? • What steps, if any, should be taken to control population growth or mitigate its environmental impacts?

Research the introduction of any two alien species into the United States and the ecological effect(s) they have had on local plant and animal populations. If the introduction was intended , explain why. If unintended, explain how it occurred. Explain why these species are so invasive.

You have your own websites , which has quite a following among the environmentally-conscious, as well as students assigned to research in your area. Each week , you post a short feature article, either a hot topic or educational column for your readers. Readers are welcome to ask questions or post their own information/ personal experience regarding the topic on your site. This week , you have decided to post a web article about alien species. Research the introduction of any two of the following alien species into the United States and the ecological effect(s) they have had on local plant and anim... click for more