6-3 Causes of Volcanic Eruptions

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 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

Where are most volcanoes found?

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

Volcanoes that have recently erupted are known as:

• Extinct Volcano
• Dormant Volcano
• Active Volcano
• What's a volcano?

If a volcano's magma is high in silicia, the volcano will probably

• erupt quietly
• remain dormant
• erupt explosively
• produce dark color lava

When groundwater heated by magma rises to the surface and collects in a natural pond, it is called a

• hot spring

• geyser

• vent

• pyroclastic flows

The main hazard from a quiet volcanic eruption is 

• volcanic bombs
• lava flows
• volcanic cinders
• volcanic ash

A volcano that may erupt again at some time in the near future is or is showing signs of erupting is

• active
• dormant
• explosive
• extinct

When an explosive eruption  forms a mixture of hot rock, ash, and gas, this material is called a...?

• Land slide
• Lava
• Eruption trail
• Pyroclastic flow

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

• Hot Spot

• Magma

• Lava

• Volcano