Volcanoes Review

Which types of magma contains the least amount of SiO₂

• rhyolitic
• andesitic
• felsic
• basaltic

The composition of magma determines its _____.

• viscosity
• darkness
• color
• none of the above

Volcanoes that are made of basalt lava flows are called _____.

• shield volcanoes
• composite volcanoes
• stratovolcanoes
• cone volcanoes

A  line of volcanic activity that surrounds the Pacific Ocean basin is the 

• Ring of Fire
• Aleutian Islands
• Hawaiian Islands
• Caribbean Islands

This volcano is most likely which type of volcano?

• Felsic
• Composite
• Shield
• Cinder cone

What is a determining factor in which type of eruption will occur?

• the chemistry of the magma
• the size of the mountain
• the climate around the volcano
• the number of people living near the volcano

As the temperature of lava increases, ________

• its viscosity decrease
• it begins to harden
• its viscosity increases
• it can flow a much short distance

Which list places the magma types in order of decreasing viscosity (most viscous listed first)?

• basaltic, andesitic, rhyolitic
• rhyolitic, andesitic, basaltic
• andesitic, basaltic, rhyolitic
• basaltic, rhyolitic, andesitic

Once magma reaches the earth's surface it is called.....

• Silica
• Rock
• lava

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

• Batholith
• Caldera
• Geyser