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Make a Lake
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Where rainwater goes after the rain stops? And why there are rivers and lakes in some parts of the land but not in others?

Filtration Investigation
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In this activity, learners explore how engineering has developed various means to remove impurities from water.

Great Steamboat Race
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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.

Saguaro Nest Cavities
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This activity (on page 3 of the PDF under GPS: Cactus Activity) is a full inquiry investigation into how some desert birds keep their cool.

Layered Fossil Parfait: Deeper is Older
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In this activity, learners explore dinosaur fossils by making an edible treat. First, learners read "Dinosaur Bones" by Aliki to examine how fossils are formed.

From the Ground Up
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In this plant science activity, learners conduct four experiments to observe how plants respond to sunlight and gravity.

Can Fishing
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In this outdoor activity, learners go "can fishing" and discover the kinds of aquatic organisms that live in and on submerged cans.

Exploring Size: StretchAbility
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In this game, learners explore the different sizes of things in the world. In this Twister-like game, learners must place a hand or foot on a circle of the right scale - macro, micro, or nano.

Clear Water, Murky Water
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How do scientists measure how clear or murky water in a lake is? How does water clarity (clearness) affect what lives in the lake?

Bury Me Not!
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This activity (page 2 of the PDF under SciGirls Activity: Bogs) is a full inquiry investigation into decomposition.

Seeds: Roots and Shoots
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In this indepth hands-on activity, learners build a structure that allows them to observe the growth of roots and the correlation between root growth and stem extension.

How Might Elevated CO2 Affect Plants
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In this activity, learners conduct an experiment to investigate the effect of elevated levels on CO2 on plant growth.

Sand Dunes
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This outdoor activity (on page 2 of the PDF under SciGirls Activity: Sand Dunes) is a full inquiry investigation into how the amount of moisture in a sand dune relates to the number of plants growing

Quick Frozen Critters
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In this activity, learners play an active version of freeze tag based on predator/prey relationships.

Makin' Tracks
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In this activity, learners make plaster casts of an animal track to learn more about animals and animal behavior.

Nature Walk
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In this activity, learners take an indoor nature walk and discover various objects that have been brought in from the outdoor environment.

Litter Critters
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In this outdoor activity, learners use a "litter-critter" wheel to help them identify different animals they find living in a natural litter habitat.

Capturing Carbon Dioxide
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In this activity, learners investigate carbon sequestration by creating a carbonated beverage out of apple juice and dry ice.

Coverslip Traps
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In this activity, learners use coverslips to collect organisms from a pond, estuary or marine environment and then examine what they have caught with a microscope.

Tree Growth Investigation
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This activity (located on page 3 of the PDF under GPS: Temperate Rain Forest Activity) is a full inquiry investigation into tree growth rates.