volcanoes

__________ volcanoes are usually steep sided. They are formed from layers of ash and lava.

• Shield

• Composite

• cone

• Extinct

__________ volcanoes are formed from fast flowing, lava which flows easily over the surface, forming larger volcanoes with gentle sides.

• Cone
• Composite
• Angel
• Shield

This plate is involved in all of the Ring of Fire Volcanoes.

• The Nazca Plate
• The North American Plate
• The Pacific Plate
• The Indian Plate

Ring of Fire Volcanoes have...

• pyroclastic and flowing lava

• Sea water trapped inside

• Huge, violent eruptions

• All of the above

What percent of the Earth's volcanoes reside in the Ring of Fire?

• 75%
• 100%
• 90%
• 0%

A subduction zone is...

• plates pull apart.

• the continental plate slides under the oceanic plate.

• where oceanic plate slides under another oceanic plate

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