Hazardous Environment

Once magma reaches the Earth's surface it is called.......

• Silica

• Lava

• Rock

• Molten

TRUE or FALSE: A volcano that erupts quietly will produce a lot of cinders, ash, and bombs

• TRUE

• FALSE

Which of the following terms are used to describe a volcano that may erupt at any time? 

• Dormant volcano
• Active volcano
• Extinct volcano
• Shield volcano

Which of the following terms best describes a volcano that is dead and unlikely to erupt again? 

• Dormant volcano
• Extinct volcano
• Shield volcano
• Caldera

Which of the following terms are used to describe a volcano that is has not recently erupted, but may in the future? (aka sleeping volcano)

• Composite volcano
• Active volcano
• Extinct volcano
• Dormant volcano

As the country with the most active volcanoes, how do the government of Indonesia reacted to the eruption?

• alerting people living nearby

• monitoring the activity

• create an emergency evacuation if something happen

• don't bother to act

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 tool helps a volcanologist to monitor seismic activity?

• Radar

• GPS

• Thermometer

• Seismograph

A mixture of hot gases, ash, cinders, and bombs that erupt explosively are called a(n)...

• pyroclastic flow
• lava flow
• volcanic cloud
• active mixtures

What is an earthquake?

• When the earth causes an upward thrust in the epicenter.
• When the earth moves up and down along the ocean floor.
• When tectonic plates move against each other causing the earth to move. 
• None of the above