Look up! All mountains rise high into the sky, but there is more to these landforms than meets the eye! Some form when two pieces of Earth's crust push up land. Erupting volcanoes form others. Some are growing, while others are shrinking. Give beginning readers all the need-to-know information about mountains, including their characteristics, how they form, and where they can be found around the world. Part of the Earth's Landforms series.