Chapter 9 - Properties of Matter
Why do some materials sink to the core of a planet while others float to the crust? This experiment uses marshmallow fluff and molasses to illustrate the concept of planet differentiation.
Hands-on Activity, Classroom Activity
Brainstorm with your students a list of things that are possible in water that are not possible on land, and vice versa.
What happened after the Big Bang? This comic strip explains the interactions that lead to the creation of stars, planetary nebulas, and supernovas.
Why does cold air rush out of a freezer when you open the door? How does it then move through a room? Experiment to learn the answers—and gain insight into the blustery winds of Antarctica.
If you've spent even a few hours in a pool, you know that the deep end is colder than the shallow. But do you know why? Experiment with colored ice cubes for insight into water density.
Peer at the world through the eyes of Einstein—a scientist who saw a beam of light and imagined riding it, a self-proclaimed "citizen of the world" who spoke out on global issues from pacifism to racism.
November 15, 2002 - January 1, 2003
Gold, an enduring icon of wealth, beauty and power. Since the beginning of recorded history, the rise of influential societies has coincided with their ownership of the precious substance.
November 18, 2006 - August 19, 2007