Volcano Practice

What kind of magma produces violent volcanic eruptions?

• Magma low in silica
• Magma that is fluid, and runny
• Magma that is high in gas content
• Magma rich in iron

A huge hole that is left behind when a volcano collapses is called a

• Batholith
• Caldera
• Geyser

GPS, Tilt-meters, Gas sensors and seismic activity are all used to __ 

• Monitor volcanoes to try to predict them
• Prevent volcanic activity
• Back up scientific claims about earthquakes
• Contain volcano hazards 

Highly explosive volcanoes tend to have what type of magma?

• magma with high silica, high viscosity, and higher gas content
• magma with low silica, low viscosity, and lower gas content
• magma with low silica, high viscosity, and lower gas content
• magma with no silica, high viscosity, and no gas content

The volcanoes on the Hawaiian Islands form due to which of the following?

• Divergent Boundary
• Hot Spot
• Subduction Boundary
• Transform Boundary

True or False: A pyroclastic flow occurs during an explosive eruption. 

• True
• False

TRUE OR FALSE:  A substance that flows quickly has high viscosity...

• True
• False

In volcanic areas, groundwater heated by magma is a source of 

• lava flows
• silicia
• geothermal energy
• pyroclastic flows

Which volcanic hazard is extremely fast moving hot ash and rocks? 

• Ash
• Pyroclastic flow
• Lahar

What igneous intrusion is labeled "F"

• Sill
• Dike
• Lacolith
• I wonder what I'll have for dinner??