The mantle is made of melted, molten rock called

When magma reaches earth's surface, it creates a

Volcanoes are constructive. The magma cools on the surface and becomes new rock.

The line of volcanoes that surround the Pacific Ocean's subduction zone is referred to as the

The islands of Hawaii were formed by volcanoes at a

The islands of Hawaii formed from volcanoes on the ocean floor adding new rock over a long period of time and eventually forming a new island

The volcanic island of Surtsey is a part of the Mid-Atlantic Ridge and is growing larger everyday. This is an example of how volcanoes can be

At mid-ocean ridges, the plates pull apart and magma pushes up between the plates. As the magma cools and hardens into new rock on the ocean floor, it causes

Volcanoes are never destructive

People can control and stop volcanoes from erupting.