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In this activity, young learners (2 years and up) explore dirt and what is in it by painting with mud.

In this international citizen science activity, learners measure their night sky brightness and submit their observations into an online database.

In this outdoor activity and fun race, learners first find the most common type of tree in a forest site.

In this activity, learners will construct a measuring device (snake "string") to improve their observation skills.

In this outdoor activity, learners discover that plants aren't just shoots (stem, branches, leaves, and flowers) growing above ground, but contain plenty of roots growing underground—more than half th

In this outdoor activity, learners construct bird feeders and set them up at to investigate bird behavior for one or two weeks. Multiple feeder designs are suggested.

In this optics activity, learners split white light into all its component colors using three household items: a compact disc, dishwashing liquid, and a hose (outside).

In this outdoor, ocean-side activity, learners investigate the distribution of organisms in the upper region of the intertidal zone.

Learners place water and part of an antacid tablet in a film canister. The reaction creates a gas reaction that launches the film canister like a rocket.

In this activity (located on page 3 of the PDF), learners investigate the way water moves and how we can control and direct water.

In this outdoor activity, learners build bird nests and place them in the activity area, then play the role of naturalists as they try to locate each other's nests.

In this activity, learners build large-scale structures and cantilevers in a series of "building out" challenges with garden poles and tape.

Everybody loves bubbles, and this is the best bubble recipe ever!

In this activity (located on page 2 of the PDF under GPS: Temperate Rain Forest Activity), learners will identify a group of deciduous trees to study.

In this math lesson, learners participate in several activities where they apply measurement skills.

In this activity, learners build rockets and shoot them into the air by stomping on the plastic bottle launchers.

In this activity, learners compare plant and animal life in different habitats including a sidewalk crack and lawn. Learners sort human-made materials and natural materials found in each habitat.

This activity shows how our experience of the Sun changes with time and location. The sun dagger at Chaco Canyon is thought by many to be a sort of ancient timekeeping device.

In this activity, learners construct a simple air pressure launcher for paper rockets.

In this outdoor activity, learners visit the intertidal zone of a rocky coastal site well populated with marine organisms.