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ReadWriteThink
Read Write Think: Red Write Think: Celebrate the 100th Day of School
Use the activities and resources in this lesson plan from ReadWriteThink to find ways to celebrate the 100th day of school.
Encyclopedia of Earth
Encyclopedia of Earth: Water Pollution: Groundwater
Explains what groundwater is, how and where it occurs, how the quality of our groundwater is being affected by human activities, and the detrimental impact this has on plants and animals. (Updated: February 22, 2012)