Q:

What is a main vent in a volcano?

A:

Quick Answer

The main vent of a volcano is the outlet chamber in the Earth's crust that allows hot magma to reach the surface. While secondary vents may form to alleviate the pressure caused by a magma chamber, the main vent is responsible for giving volcanoes their familiar cone shape.

 Know More
What is a main vent in a volcano?
Credit:Chris ClorBlend ImagesGetty Images

Full Answer

Magma chambers are large reservoirs beneath the Earth's crust that hold hot magma. Magma is less dense than the materials that make up the mantle, which causes it to pool below the crust and exert pressure. When the pressure is too great, magma is expelled through the main vent of a volcano.

Learn more about Volcanoes

Related Questions

  • Q:

    What causes a volcano to form?

    A:

    A volcano forms when magma pushes up through the Earth's crust from below, depositing lava on the surface. This lava cools, creating volcanic rock. Over time, repeated eruptions of lava build a cone-shaped mountainous structure, producing a volcano.

    Full Answer >
    Filed Under:
  • Q:

    What is a volcano?

    A:

    A volcano is a place where molten rock seeps or erupts from beneath the crust. Most volcanoes develop in the oceans, but some occur on land. When the molten rock, which is called lava, erupts with force, large, cone-shaped mountains form, which are also called volcanoes.

    Full Answer >
    Filed Under:
  • Q:

    How does a volcano form?

    A:

    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 >
    Filed Under:
  • Q:

    What causes a volcano?

    A:

    Volcanoes form when magma, a mixture of hot gas and molten rock, flows out of fissures in Earth's crust. The powerful eruption creates vents in the crust, and mountainous formations take shape above ground as molten rock spreads out in layers and gradually cools down. Each successive eruption occurs when more gas and magma accumulate in the vents, building pressure below the crust.

    Full Answer >
    Filed Under:

Explore