Volcanoes are formed when magma (liquid rock) trapped underneath the Earth’s crust rises to the surface and escapes through cracks. The space for the magma to leave is very small and ...

The graphic below shows how the movement of the Earth's tectonic plates causes volcanoes to be formed, and what triggers a volcanic eruption.

The Eyjafjallajokull volcano began erupting in March ... Most of it was very fine particles which formed an ash cloud, rising 6-10km (20,000-35,000 feet) into the atmosphere. Ash clouds pose great ...

Various volcanic features can be found on the rocky planets neighboring Earth. Mars contains volcanic plains formed by past eruptions and inactive shield volcanoes that are much more massive than ...

It creates jagged coastlines, mountain ranges, and volcanoes. This is the process that formed the Cascade Mountain Range in Washington and Oregon! A convergent fault is when two plates push into ...

Igneous rocks form when magma cools underground or erupts at the surface as lava. The magma rises into the Earth’s crust, where it can get trapped underground or erupt from volcanoes as molten lava.

Through geochemical analyses, geoscientists at Heidelberg University have shown that the millimeter-sized sapphire grains found in the Eifel (Germany) formed in association with volcanism.

Why does Hawaii have so many volcanoes? The Hawaiian Islands are a chain of volcanoes formed over millions of years. They’ve developed as the Pacific Plate - one of more than a dozen tectonic pl ...