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

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

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

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

In this demonstration, learners compare the relative sizes and masses of scale models of the planets as represented by fruits and other foods.

In this outdoor activity, learners explore UV rays from the Sun and ways to protect against these potentially harmful rays.