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In this activity, learners measure the diameter of their water balloons, model an impact, measure the diameter of the “crater” area, and determine the ratio of impactor to crater.

Before there were clocks, people used shadows to tell time. In this outdoor activity, learners will discover how to tell time using only a compass, a pencil, a handy printout, and a sunny day.

In this activity, learners help create and then navigate an outdoor course of the traditional "planets" (including dwarf planet Pluto), which are represented by small common objects.

In this indoor and/or outdoor activity, learners make an anemometer (an instrument to measure wind speed) out of a protractor, a ping pong ball and a length of thread or fishing line.

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

In this activity (on page 14 of PDF), learners use a pan full of flour and some rocks to create a moonscape.

In this math activity, learners observe and sketch cracking patterns in pavement.

In this activity, learners use their feet to estimate distances. Learners calculate the distance of one step in centimeters by measuring 10 steps at a time to reduce measurement error.

In this activity, learners use a hand-made protractor to measure angles they find in playground equipment.

In this activity, learners will make seed orbs to grow new trees and plants. Learners will explore ecology and life cycles as well as stewardship through this activity.

In this activity, learners model a population of deer and see how the number of deer changes over time.

In this activity, learners use cooperation and logical thinking to find solutions to network problems on the playground.

In this activity, learners explore how polarizing sunglasses can help diminish road glare.

In this activity, learners use their hands as tools for indirect measurement.

In this activity on page 13 of the PDF, use a special plastic card that has been painted with a chemical that changes color when it is in UV light.

In this quick activity (page 1 of PDF under SciGirls Activity: Lift Off), learners will use the ever-popular soda geyser experiment to test the reactivity of the various sugar candies or mints.

In this activity, learners use a simple 3D model to discover why the Moon has phases.

Build time sense into the schedule by asking learners to predict what can happen in a certain amount of time: We have 20 minutes before outdoor time. What can you get done?

In this activity, learners make their own pinhole viewer in order to measure the size of the sun.

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