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"EcoKids Glossary. In here you'll find definitions for many ecological and environmental terms."

"Citizen Science is an online flash-based computer adventure game in which the player is a young adult who becomes concerned about the health of a local lake threatened by eutrophication. Based at Lake Mendota in Madison, WI, the player�s goal is to restore the lake. By focusing on the ecological needs of Lake Mendota as well as the surrounding community, the game is able to bring together real-world issues and scientific practices. "

"Turn your students into citizen scientists in three simple steps! Project Noah was created to provide people of all ages with a simple, easy-to-use way to share their experiences with wildlife. By encouraging your students to share their observations and contribute to Project Noah missions, you not only help students to reconnect with nature, you provide them with real opportunities to make a difference."

Take the next step up the foodchain to take a look at predators.

"The order that animals feed on other plants and animals is called a food chain. Do you think you can put a food chain together? give it a try and learn why every animal within a food chain is so important."

"Geographic distribution of acid rain Acidity in rain is measured by collecting samples of rain and measuring its pH. To find the distribution of rain acidity, weather conditions are monitored and rain samples are collected at sites all over the country. The areas of greatest acidity (lowest pH values) are located in the Northeastern United States."

"The most important gas which leads to acidification is sulfur dioxide. Emissions of nitrogen oxides which are oxidized to form nitric acid are of increasing importance due to stricter controls on emissions of sulfur containing compounds. 70 Tg(S) per year in the form of SO2 comes from fossil fuel combustion and industry, 2.8 Tg(S) from wildfires and 7-8 Tg(S) per year from volcanoes.[24]"