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In this activity, learners will explore how a hydrometer works by building a working model and conducting experiments.

In this activity, learners explore atoms as the smallest building blocks of matter. With adult help, learners start by dividing play dough in half, over and over again.

Learners build models of sinkholes to gain an intuitive knowledge of their physical aspects.

Learners work in groups to construct bridges using stale marshmallows and toothpicks.

Learners design, build, and test models of "dragon boats" made from up to three milk cartons.

Learners build models to learn about the special cells and structures that plants use to move water from their roots up through the stems and leaves.

In this design challenge activity, learners build a boat that can hold 25 pennies (or 15 one inch metal washers) for at least ten seconds before sinking.

In this quick activity (located on page 2 of the PDF under GPS Wetlands Activity), learners will model how wetlands act as natural filters for the environment.

Learners act as engineers and design mini submarines that move in the water like real submarines.

Learners gain an intuitive knowledge of the physical aspects of watersheds by creating their own watershed models.

This activity models some of the ways natural processes, such as erosion and sediment pollution, affect Earth’s landscape.

Learners will explore the scientific mystery behind a disappearing group of trees by examining data and attempting to explain the decline.

In this activity (located on page 6 of the PDF), learners explore the ways people access water in their homes.

In this outdoor, sunny day activity, learners experiment with paper leaf models to discover how some desert plants conserve water.

In this activity, learners use tinfoil to build and test their own boats - which designs will float, and which will sink?

In this outdoor activity/field trip, learners investigate the special shapes, holding structures and holding behaviors that real organisms use in streams, rivers, creeks or coast intertidal zones to a