Rocks are constantly changing form through weathering, heat, pressure, and erosion. Although rocks are constantly changing, the process can take millions of yea

The land, water, and air on our planet are always changing! Learn about the water cycle, the rock cycle, volcanoes and earthquakes, fires and floods, adaptation

Explore the water cycle in this fascinating book! Readers will learn the various steps of the water cycle--including evaporation, condensation, and precipitatio

Discusses how different rocks are formed, describes various types of metal, and provides both past and current uses of these materials.

The Inka were master farmers, builders, and planners who lived in the Andes Mountains. This challenging environment required the Inka to develop innovative engi