Volcanoes

a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt

A volcano that has not erupted for a long time, but may erupt again one day.

a volcano that is erupting or has shown signs that it may erupt in the near future

The opening through which molten rock and gas leave a volcano

a bowl-shaped opening at the top of a volcano

volcanic regions fed by underlying mantle that is hotter than nearby mantle

Volcanic event that can be created when magma is very thick, and clog up a volcano, stopping gases from erupting, leading to a buildup of pressure. often levels of silica and trapped water vapor are very high, causing high viscosity

occurs when magma flows easily and gently bubbles out, the lava is thin and runny as it oozes out quietly from the vent. This type of magma has a low amount of trapped water vapor and silica, which allows the magma to flow easily

Broad volcano with gently sloping sides built by nonexplosive eruptions of basaltic lava that accumulates in layers.

volcano built by alternating explosive and quiet eruptions that produce alternating layers

A major belt of volcanoes that rims the Pacific Ocean.

A string of islands formed by the volcanoes along a deep-ocean trench

A pool formed by groundwater that has risen to the surface after being heated by a nearby body of magma.

a material found in magma that is formed from the elements oxygen and silicon

a volcano that scientists say will never erupt again.