The inside of a volcano has one or more vents through which gas and lava flow during eruptions. Below the vent is the magma, which is the molten rock that flows upward due to the divergence or convergence of tectonic plates in the Earth's crust. The number of vents and shape of the buildup of magma inside the magma chamber depends upon the type of volcano.Know More
Cinder cone volcanoes have single vents. Their bowl-shaped craters form from particles of cooling lava. Lava does not always flow from the tops, but the discharge of particles may cause lava fountains. Stratovolcanoes, or composite volcanoes, may have one or a cluster of vents. These volcanoes consist of cones formed from multiple layers of lava flows. Magma flows upward from a deep magma reservoir and flows out through breaks in the wall of the crater and cracks and fissures on the sides.
Shield volcanoes may have one or a group of vents through which lava flows. They usually have broad slopes spread out over a large area. The fluid lava flows not only through the vents but from rift zones that open on the flanks. Lava domes are formed by the accumulation of highly viscous lava within a vent chamber. These buildups can cause explosive eruptions or collapse to cause deadly pyroclastic currents of swift-flowing lava.Learn more about Volcanoes
The lava from a volcano ranges in temperature from 570 to 2,120 degrees Fahrenheit. In comparison, water boils at 212 F, and a pizza oven is generally 500 to 600 F.Full Answer >
A volcano that has recently erupted and may erupt again soon is categorized as an active volcano. Dormant and extinct are also categories of volcanoes.Full Answer >
The two basic types of volcanic eruptions are effusive and explosive eruptions. In effusive eruptions, magma flows to the surface and down the sides of the volcano as lava. In explosive eruptions, magma violently rips through the top portion of the volcano and reaches the surface in pieces.Full Answer >
Various factors trigger a volcanic eruption. The three predominant factors are the magma's buoyancy, the pressure from the gases that separate in the magma and the merger of a new batch of magma with a chamber already filled with magma.Full Answer >