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In this activity about saturation (page 1 of PDF under SciGirls Activity: Sand Dunes), learners will build a series of sand castle towers using a 16 oz cup.

Learners explore the variables that affect the properties of ice and the places where different types of ice are found.

In this activity (on pages 36-39), learners make a model of a watershed out of paper, then run water down the mountain to simulate how rainfall and pollution affect watersheds.

In this activity, learners explore the function and engineering of dams and how dams have many uses and solve many problems in the world.

Learners create a model of a wetland to observe how it absorbs and filters water from the environment.

In this activity, learners explore the different heating properties of soil and water.

Learners discover that their breath contains carbon dioxide, one of the pollutants found in car exhaust.

Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

In this outdoor activity, learners race small boats, made of cork, balsa wood, popsicle sticks etc., to investigate the rate and direction of currents in a stream or creek.

In this multi-part activity learners examine non-point water pollution.

In this activity, learners observe how salinity affects the freezing point of water by making and enjoying ice cream.

In this activity, learners will explore how density is affected by temperature and how that can create currents.

This hands-on experiment will provide learners with an understanding of the issues that surround environmental cleanup.

In this activity, learners will pretend to be archaeologist using this chilling experience.

In this activity (on page 14 of PDF), learners use a pan full of flour and some rocks to create a moonscape.

In this activity, learners will build a model of a nebula using cotton balls and colored water. Astronomers photograph nebulas and add colors to provide information about the nebula's composition.

Ocean acidification is a problem that humans will have to deal with as we release more and more carbon dioxide into the atmosphere.

In this activity, learners use raisins and seltzer water to understand why waves don’t move objects forward. Learners conduct two simple experiments to understand the circular movement of waves.

In this activity, learners will create a magnifying glass called a waterscope, using water and household items, to examine various objects.

In this activity, learners create channel features with flowing water, comparing their observations to real images of Mars and Earth taken by satellites/orbiters.