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Rocks are made of minerals, and minerals often have crystal shapes. In this fun activity about geometry in nature, learners create their own crystal shapes out of paper.

Learners trace, cut out and fly a boomerang, outdoors or in a large indoor space.

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

In this activity, learners will predict the size of a giant scale model of a comb or other rectangular object, then make one. If you tripled the size of a dollar bill, could you sit on it?

In this project, students explore how levers work, by making a puppet with moving limbs.

In this activity (on page 2 of the PDF), learners use art supplies to build models of insects, both real or imagined.

In this activity, learners use information gathered from a variety of sources to design and make their own insect.

In this activity (on page 8), learners model how marble statues and buildings are affected by acid rain.

In this activity (on the left side of page 5, continued on the right side of page 4 of the PDF), learners make models of colorful butterflies.

In this activity (page 2 of pdf), learners craft a model of a skate egg case and come to understand that cartilaginous fish such as sharks and shakes employ reproductive strategies that differ from th

In this activity, learners create a model of a neuron by using colored clay or play dough. Learners use diagrams to build the model and then label the parts on a piece of paper.

Create airplanes from straws and geometric shapes. Test them out to see how far they can fly, or how accurately they can be aimed.

In this activity, learners thread gumdrops together to make a model of a polymer.

In this activity, learners construct a playable kazoo from inexpensive materials. They will experience how vibration creates sound waves and music.

Is a square stronger than a triangle? Use tongue depressors to build simple shapes. Then apply a little weight to them and see what happens!

In this activity, young learners explore the basic shapes of constellations by making their own scope out of a cardboard tube and paper with pinpricks.

In this activity, learners use recycled materials to build a bridge that holds as many potatoes as possible. They investigate weight, height, strength, and measurement as they seek design solutions.

In this activity, learners create an origami model of DNA, demonstrating its double helix structure.

No glue is needed for learners of any age to become marshmallow architects or engineers.

In this activity, learners get hands-on with geometry by making a polyhedron kitty sculpture.