An introduction to the human skeletal system, explaining how the 206 bones of the skeleton join together, how they grow, how they help make blood, what happens when they break, and how they mend.

Describes the life cycle of an apple from its initial appearance as a spring bud to that point in time when it becomes a fully ripe fruit.

Even though Mount Everest measures 29,028 feet high, it may be growing about two inches a year. A mountain might be thousands of feet high, but it can still grow taller or shorter each year. Mountains are created when the huge plates that make up the earth's outer shell very slowly pull and push against one another. Read and find out about all the different kinds of mountains. The earth's continents rest on plates that move slowly across our planet's...

A brief study of the first creatures on earth to develop voices and an aversion to dry skin.

Tells the story of the birth of an emperor penguin egg and how the father keeps it warm while the mother goes for food.

A lively introduction to the rainforest combines illustrations and diagrams with explanations about the abundant plant and animal life that can be found there.

Explains the phases of the moon--the changes that seem to happen to it as it goes around Earth.