Volcanoes

Which types of magma contains the least amount of SiO₂

• rhyolitic
• andesitic
• felsic
• basaltic

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

• shield volcanoes
• composite volcanoes
• stratovolcanoes
• cone volcanoes

About 75 percent of the world’s volcanoes are found 

• around the Atlantic Ocean basin.
  
• along the mid-Atlantic ridge.
  
• around the Pacific Ocean basin.
  
• throughout the American Northwest. 

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

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

Which of these volcanic particulates is the largest in size?

• Dust
• Ash
• Bomb
• Lapilli

This volcano is most likely which type of volcano?

• Felsic
• Composite
• Shield
• Cinder cone

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

What type of volcano is built almost entirely from ejected lava fragments?

• cinder cone
• composite cone
• shield volcano
• pahoehoe volcano

What forms when hot water and steam are trapped underground in a narrow crack and suddenly erupts?

• Hot Spring
• Geyser
• Batholith

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

• Batholith
• Caldera
• Geyser