Earth Science Chapter 9 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 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

Most volcanoes occur at which 2 types of plate boundaries? 

• convergent w/ subduction and divergent
• divergent and transform
• divergent and hot spots
• convergent w/ subduction and hot spots

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Volcanoes that are NOT found at plate boundaries occur in the middle of plates in areas called ___________. 

• hot spots
• mid-ocean ridges
• fissure volcanoes
• shield volcanoes

an opening in the Earth's surface through which volcanic materials erupt.

• crust

• lava

• vent

• conduit

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Igneous rocks start off as

• liquids

• gases

• solids

• sediments

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What is the resistance of a liquid, such as lava, to flow?

• Elasticity
• Pyroclasticity
• Silica
• Viscosity

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

What do you call a large crater formed by the collapse of a volcano?

• Caldera
• Lava Plateau
• Composite Volcano
• Shield Volcano

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