The composition of magma determines its _____.

• viscosity
• darkness
• color
• none of the above

Volcanoes are common along

• convergent plate boundaries.
• divergent plate boundaries.
• transform plate boundaries.
• two of the above

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

Which of the following factors helps determine whether a volcanic eruption will be violent or relatively quiet?

• amt of dissolved gases
• temp of magma
• composition of magma
• all of the above

As the temperature of lava increases, ________

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

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 particles produced in volcanic eruptions are called ____.

• laccoliths
• pyroclastic material
• calderas
• volcanic stocks

Before lava reaches the surface it is called

• rock
• magma
• volcanic ash
• liquid fire

Tall, cone-shaped mountains in which layers of lava alternate with layers of ash are called

• shield volcanoes
• cinder cone volcanoes
• composite volcanoes
• lava plateaus