Earth Science Chapter 18 Test- 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

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

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

What type of volcano is made of lava fragments that have been ejected from a volcanic vent?

• Caldera
• Cinder Cone
• Composite Volcano
• Shield Volcano

What is the definition of dormant?

• sleeping
• extinct
• active
• invisible

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

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