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Lakes, streams and other freshwater bodies are a habitat for lots of living things, big and small.

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

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

En esta tira cómica, Mateo y Cientina observan unas hormigas para contestar algunas preguntas: ¿Qué comen las hormigas?

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

In this activity, learners use binoculars (or a telescope) to identify and track sunspots. If using binoculars, learners need a pair that can be secured on a tripod.

In this activity, learners make their own Sun tracker to explore how ancient civilizations around the world studied the Sun.

Glare from the sun and ripples from the wind can make it hard to see what's below the surface of a body of water.