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In this lesson that includes hands-on activities and demonstrations, learners discover that it is the tilt of the Earth's axis (not its proximity to the sun) that causes the seasons.

In this online activity, learners can test their skills at finding constellations in the northern hemisphere's night sky.

In this online activity, learners see simulations of how processes shape the Earth, and see estimates of how long these processes take.

Learners work in groups to build model cars from paper parts. First, each learner builds cars individually and the group times themselves.

Pairs of learners play the roles of programmer and robot. The programmer gives specific directions to the robot to accomplish a simple task (e.g. walk across the room and pick up a pencil).