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In this activity, learners explore how light and dark colored objects absorb the Sun's radiations at different rates.

In this activity, learners apply a dissolving test to known crystals to identify the unknown. Since the unknown is chemically the same as one of the known crystals, it should dissolve similarly.

In this demonstration, learners observe vinegar and baking soda reacting to form carbon dioxide (CO2) gas.

In this chemistry activity, learners prepare two petri dishes, one filled with water and one filled with milk.

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 outdoor activity/field trip, learners locate and study plants and animals in several freshwater pond habitats.

Learners observe and conduct experiments demonstrating the different properties of hot and cold materials.

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 build models of atoms and molecules, then consider their role in different phases of matter, density, and mixtures and solutions.

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 will discover why there are holes in bread.

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

In this experiment, learners try different liquids to see which ones clean pennies best. Liquids to try include water, lemon juice, cola, vinegar, and dishwashing detergent.

In this activity related to flight, learners build a tiny stream channel to investigate how fluids (air and water) change speed as they flow between and around objects.

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

In this activity, learners will explore light and rainbows with this easy setup! Learners will only need a cup of water, some paper and a flashlight.

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

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