Sixth Grade
Worksheets
Mountains Formed by Magma
You have probably heard of Mount Saint Helens. This mountain is part of the Cascade Range in the northwestern United States. You know that these mountains were formed by magma. But did you know that the Adirondack Mountains in New York were also formed by magma?
Volcanic mountains are formed when magma erupts onto earth's surface. Many of these mountains are found along mid-ocean ridges. These are divergent boundaries where tectonic plates are spreading apart.
As the sea floor spreads apart, magma moves upward to fill the space. It cools and forms mountains. As the eruptions continue, the mountains grow taller. Huge mountain ranges are formed under the ocean.
