Volcanoes and EQs

The formation of the Hawaiian Islands is one example of

• volcanoes forming over a hot spot
• volcanoes forming along a plate boundary
• the Ring of Fire
• continental drift

Can volcanic eruptions effect climate?

• yes 
• no

Why does magma rise?

• it is less dense than the crust
• it is more dense than the crust
• it is equally as dense as the crust
• it is very viscous

What is a weak spot in the Earth's crust where magma can come through to the surface?

• Earthquake
• Fault
• Volcano
• Mid-Ocean Ridge

There are volcanoes underwater.

• True 
• False

Where is the largest volcano?

• Africa
• Indonesia 
• Wyoming
• Hawaii

If a volcano's magma is high in silica, the volcano will probably

• erupt quietly
• remain dormant
• erupt explosively
• produce dark color lava

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

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

The particles produced in volcanic eruptions are called ____.

• laccoliths
• pyroclastic material
• calderas
• ash

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