Explore the water, land, and air around us with this entertaining and informative look at our magnificent planet—and learn how your experiments, activities, a

This lively collection of fascinating facts and fables, colorful cartoons, and dynamic illustrations explains how everything on Earth is connected. Since its or

"I take care of the earth because I know I can do little things every day to make a BIG difference..." With his signature blend of playfulness and sensitiviy, T

A ball drops to the ground. Leaves fall from a tree. Gravity is at work all around you. But what exactly is gravity? And how does it affect different objects? R

Soil contamination . . . public lands . . . surface and groundwater pollution . . . coastal erosion . . . global warming. Have we reached the limits of this pla