Volcanoes are among the most spectacular geological features on the planet. Jump into an exploration of these amazing phenomenon with this multimedia lesson series. Working collaboratively in small groups, young scientists view videos...

Charon, the largest of Pluto's moons, was discovered in 1978. Lesson is a walk through of how to solve for the phases of Charon. It uses two different points on Pluto and takes into account the tilt of the pole, the rotational axis, and...