Volcano review

What are the two characteristics scientists use to classify volcanoes

Several types of volcanic eruptions—during which lava, tephra (ash, lapilli, volcanic bombs and blocks), and assorted gases are expelled from a volcanic vent or fissure—have been distinguished by volcanologists.

What are the factors that affect a eruption style

The nature of a volcanic eruption is determined by the temperature, viscosity and the amount of dissolved gases in the magma, according to San Diego State University. These factors determine whether an eruption is calm and nonviolent or explosive.

Where do volcanoes come from

The word "volcano" originates from Vulcan, who is the Roman god of fire said to have a forge on Vulcano, a volcanic mountain in Italy. There are 1,500 known volcanoes around the world and Hawaii's Mauna Loa is the largest volcano on earth.

What are the three types of volcanoes shape and size of each one

Video: Types of Volcanoes: Shield, Cinder Cones & Composite Cones. The earth ejects lava, rock fragments, hot vapor and gases during volcanic eruptions. Volcanoes vary based on size, shape, composition and eruptive style. Learn about the different types of volcanoes, such as shield, cinder cone and composite cone.

How do volcanoes form

Volcanoes are formed when magma from within the Earth's upper mantle works its way to the surface. At the surface, it erupts to form lava flows and ash deposits. Over time as the volcano continues to erupt, it will get bigger and bigger.

What is a volcano

a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust.

What are the four factors that scientists monitor to determine the likelihood of a volcanic eruption

Monitoring a volcano requires scientists to use of a variety of techniques that can hear and see ... in volcanic activity and determine whether and when a volcano might erupt in the future.