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In this optics activity, learners discover basic lens-making techniques by using a tennis ball to make a lens out of ice.

In this optics activity, learners make a simple telescope using two lenses and a cardboard tube. Learners construct the telescope and then calculate its magnification.

This fun and simple hands-on astronomy activity lets learners explore the difference between telescope magnification and resolution.

In this activity related to microbes, learners make slides of cells from an onion skin and Elodea (American or Canadian waterweed) to observe under a microscope.

In this activity, learners draw natural objects to explore the details, differences, and similarities of natural objects.

This activity (on page 2 of the PDF under SciGirls Activity: Earthquakes) is a full inquiry investigation into aerial imagery.