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

In this design challenge, learners design a storm drain cover that catches litter to protect waterways to learn about how local actions can have system-level effects.

In this activity on page 24, learners perform experiments to examine whether or not trash can float, blow around, or wash away.

In this activity, learners explore the web of connections among living and non-living things.

This is an activity about turbidity, or the amount of sediment suspended in water.

In this activity (on page 2 of the PDF), learners explore surface tension by adding pennies to cups which are "full" of plain water or soapy water.

In this chemistry activity (on page 2 of the PDF), learners corrode a penny in a cup with vinegar, salt water, and a source of iron (nails, paper clips, or twist ties).

In this activity, learners explore the Great Plains.

This activity encourages learners to focus on the natural environment of the Eastern Woodlands before the arrival of European settlers.