Chapter 13 - 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

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

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

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

Lava that is very thin and runny probably

• has low silica content

• is high in silica

One major belt of volcanoes that surrounds the Pacific Ocean

• Ring of Fire

• Ring of Asia

• Ring o' earthquakes

• Ring a ding ding

A bowl shaped area that may form at the top of a volcano around the central vent

• crater

• vent

• tube

• leftovers

The more silica that magma contains...

• the thicker the magma
• the thinner the magma
• the higher the viscosity
• the runnier the magma

When a volcano erupts, empties the magma chamber, and collapses the top leaving a huge hole.

• Dike
• Caldera
• Silica
• Geyser