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This fun and simple hands-on astronomy activity lets learners experiment with marbles and weights to discover some basics about gravity and black holes.

An estuary is a body of water that is created when freshwater from rivers and streams flows into the saltwater of an ocean.

This is an activity (on page 2 of the PDF under Surface Area Activity) about surface area to volume ratio.

In this design challenge activity, learners invent an emergency shelter that can fit a person and is sturdy and quick to build.

In the wild, small crustaceans known as brine shrimp live in marine habitats such as saltwater lakes.

This fun and simple hands-on astronomy activity lets learners imagine what would happen if our Sun were replaced with a black hole.