The main parts of a volcano include the summit crater, the magma chamber, the central vent and the edifice. While volcanoes vary considerably in terms of size and shape, most land volcanoes have structural similarities.Know More
Molten lava is released from the mouth of the volcano, known as the summit crater. The underground chamber in which the lava wells up is known as the magma chamber. The central vent joins the magma chamber and the summit crater. The edifice is the structure that surrounds the central vent. The varying shapes of the summit crater and the edifice characterize different types of volcanoes. The shape, structure and composition of the edifice are determined by the nature of the eruption and the volcanic material that erupts from the volcano, which builds the edifice.
Volcanoes have three basic shapes: stratovolcanoes, which have steep, symmetrical sides that lead up to a small summit crater; scoria cone volcanoes, which have a very wide summit crater with steep, symmetrical sides; and shield volcanoes, which are wide and short but become a bit steeper near their wide summit craters. Scoria cone volcanoes are the most common type of volcanoes.
Volcanic activity also creates other types of structures, such as calderas, which form when the magma chamber completely drains out, and lava domes, which form when the slow-pouring lava creates a dome that plugs the crater.Learn more about Volcanoes
An active volcano is one that has had at least one eruption in the past 10,000 years. An active volcano can be dormant or erupting.Full Answer >
A volcano forms when a vent in the Earth's crust allows magma to well up from below. The magma fills a void underneath the surface, and when it builds up enough pressure, it bursts through to the surface. As the magma cools, it hardens into rock, and multiple eruptions may build up the mountainous form of a volcano.Full Answer >
A magma chamber is a structure made up of solidified crystal mush and molten rock located below the surface of the Earth. When a magma chamber solidifies and cools, it is known as a pluton.Full Answer >
An inactive volcano is one that could erupt but has not erupted for more than 10,000 years. Inactive volcanoes are also called dormant or sleeping volcanoes.Full Answer >