The Sun is our greatest source of energy. Without its light and heat, life on Earth would not exist. For centuries, people have used the Sun's energy to heat their homes and cook meals. Today, we use
A waving flag, blowing leaves, a kite soaring through the sky-all are moved by wind power. Wind is also our fast-growing source of energy. Find out how wind forms and the different ways we may use it
As the energy crisis deepens, alternative energy sources are being explored throughout the world. Although nuclear energy is powerful and dangerous, we have been able to harness its technology to ben
Focusing on a key topic in the second grade social studies curriculum, Life on the Edge explores how people adapt to their environment and how they impact it. Readers will learn about life in four fa
Focusing on a key topic in the second grade social studies curriculum, Life on the Edge explores how people adapt to their environment and how they impact it. Readers will learn about life in four fa
Life Long Ago brings ancient civilizations to life and reinforces important early elementary social studies standards such as time, continuity, and change. Students will learn what daily life was lik
