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Density Stackers
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In this activity, learners investigate density as they discover how liquids separate to form density layers. Learners discover what happens when they add syrup, cooking oil, and water to a jar.

Solving Dissolving
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The Sacred Cenote at Chichén Itzá is a sink hole, or well, containing groundwater. In this activity, learners create their own cenote using chalk, limestone, acids, and rain water.
Create a Mangrove Tree
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In this group activity, learners will explore the characteristics, functions and uniqueness of the mangrove tree.

Super Soaker
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In this activity (page 1 of the PDF under SciGirls Activity: Bogs), learners will test cups full of potting soil, sand, and sphagnum moss to see which earth material is able to soak up the most water.

What-a-cycle
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In this activity, learners act as water molecules and travel through parts of the water cycle to discover that it is more complex than just water moving from the ground to the atmosphere.

A Crayon Rock Cycle- Sedimentary
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This is part 1 of the three-part "Crayon Rock Cycle" activity. In this activity, learners explore how sedimentary rocks form.

Build a Tree
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This activity (on pages 13-18) has learners build a model tree and then figure out how to make their tree stand up by itself.

Weather Stations: Winds
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In this activity, learners use a toaster to generate wind and compare the appliance's heat source to Jupiter's own hot interior. Learners discover that convection drives wind on Jupiter and on Earth.

Bat Echolocation
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In this activity, learners investigate how bats use echolocation to navigate. One learner is assigned to be a bat, while the other learners are selected to be either moths or trees.

Shake It!
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In this outdoor activity that can be combined with a hike, learners try to match a "mystery community" by shaking animals out of different trees and shrubs.

Damsels and Dragons
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In this outdoor activity/field trip, learners conduct experiments to explore where dragonflies and damselflies perch or rest, and how the flies change behavior in reaction to other flies or fly decoys

Low-Tech Water Filter for High-Impact Clean
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In this activity, learners consider the water features they might enjoy at a community park--a pond, brook, water playground (or "sprayground"), or pool--and what happens to the water over time.

Teen Moon: Moon Ooze
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In this activity, learners model how the Moon's volcanic period reshaped its earlier features.

Build a Giant Puzzle!
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In this activity, learners assemble large cubes to make nano-related images. Learners discover how different objects are related to nanoscience and nanotechnology.

What am I?
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In this activity, learners examine nanoscale structures of common things.

Backard Bioblitz Bonanza
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In this activity, learners will observe and record living things with in outlined outside space.

Flower Power
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In this activity, learners will experiment with changing flower colors. Learners will investigate the effects of acids and bases on flower colors.

Caller ID: The Frog - and Toad! - Mating Game
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This activity is a sensory experience that recreates the sounds of a pond at night.

Build A Dinosaur Nest
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In this outdoor activity, learners will gather natural materials outside that they think a dinosaur would want to lay its eggs in.

Weather Stations: Phase Change
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In this activity, learners observe the water cycle in action! Water vapor in a tumbler condenses on chilled aluminum foil — producing the liquid form of water familiar to us as rain and dew.