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Volcano Study Guide Part 2

The peak (or highest point) of a mountain is also called the ______? summit
Where are most of the world's active volcanoes located? The Ring of Fire, which encircles the Pacific Ocean
What are mid-ocean ridges? Volcanic land forms that form at divergent plate boundaries
How is a volcanic neck formed? It is formed when the solidified volcanic pipe remains are the most of the outside of the volcano has been eroded away.
Lava plateaus form when? Lava flows out of fissures (or cracks) in the Earth.
The two most abundant gases released during a volcanic eruption are ______ and _______? Water vapor and carbon dioxide
The most explosive volcanoes have magma that has a ____ silica content, a ____ viscosity, and a ____ gas content. high, high, and high
Felsic magma contains about _____ silica. 70%
Magma rises because it is _____ _____ than surrounding rock. less dense
___ _____ are unusually hot regions of the mantle which melts rock and forces it through the crust to form a volcano. Hot Spots
Most volcanoes occur at __________ boundaries. convergent
When does a pyroclastic flow happen? A pyroclastic flow occurs when gas, ash, tephra move down the slope of the volcano.
When the top of a volcano collapses, it creates a larger depression around the vent called a _______. caldera
What is a crater? The bowl shaped depression around the volcano's vent.
An opening in the Earth's crust where lava escapes is the ____? vent
Felsic magma is ____ explosive than mafic magma. more
The more ______ the magma contains, the more _______ it is. silica, viscous
Viscosity is? A liquid's resistance to flow.
Tephra is? Dust, ash, rock fragments, volcanic blocks, or volcanic bombs thrown into the air during an eruption.
Created by: tschuck