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Millions of organisms can live in and around a body of water.

Using a real-size sketch of a baby elephant's footprint, learners estimate, measure and record the width (diameter) and outside edge length (perimeter or circumference) of the footprint.

How do you measure a bubble when it's floating? You can't really, but in this activity, learners can measure the diameter of the ring of suds a bubble leaves on a flat surface.

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

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