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Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.

Many people get water from a source deep underground, called groundwater.

Water on Earth is in lakes, the ocean, rivers, underground, and frozen glaciers.

The Sacred Cenote at Chichén Itzá is a sink hole, or well, containing groundwater. In this activity, learners create their own cenote using chalk, limestone, acids, and rain water.