Volcanoes

What is molten rock that has formed deep within the Earth?

• Hot Spot
• Magma
• Lava
• Volcano

What is molten rock that has reached the Earth's surface?

• Aa
• Lava
• Magma
• Pahoehoe

What factor(s) determine(s) whether an eruption will be explosive?

• The amount of gases in the magma
• The amount of silica in the magma
• The amount of gas and silica in the magma
• None of these affect the explosiveness of the volcano

As magma rises towards the surface it collects in a 'room' called a _____ _____ . 

• magma chamber
• side vent
• main vent
• lava chamber

Vocanoes are found...

• on land
• under water
• on islands
• all of the above

Where is the largest volcano?

• Africa
• Indonesia 
• Wyoming
• Hawaii

What is a volcano?

• A mountain that has lava all over it 
• A giant hill filled with magma
• A long high sea wave 
• A hole in the Earth where magma erupts

The difference between magma and lava is _____

• where it is found (above or below the surface)
• how hot the molten rock is (lava is hotter than magma)
•  the type of boundary where it forms
• the viscosity of the molten rock (lava has a lower viscosity)

Where are most volcanoes found?

• Southern Hemisphere
• Ring of Fire
• Mid-Atlantic Ridge
• Hot Spots

What is / are sign(s) that a volcano may erupt soon?

• Earthquake activity in the area
• Changes in the shape of the volcano
• Different amounts of gas being produced
• All of these are signs