Understanding Volcanoes

What is a fracture or opening in the Earth’s crust that allows hot gas, lava and rocks to pass through?

• Volcano

• Eruption

• Magma Chamber

• Seismometer

What are scientists who collect data about volcanic activity called?

• Volcanologists

• Geologists

• Seismologists

• Meteorologists

Match the volcanic gases and their dangers:

• Pooling gas may be lethal

• Sulfur Dioxide

• Causes acid rain that poisons water/land

• Hydrogen Sulfide

• Strong odor, irritates skin, eyes, nose

• Carbon Dioxide

• Smells like "sewer gas"

• Hydrogen Halide

What is the term for the mix of hot lava blocks, pumice, ash and volcanic gas that moves at high speeds down volcanic slopes?

• Tephra

• Lava Flow

• Pyroclastic Flow

• Volcanic Ash

What are the fine strands of volcanic glass fiber formed from lava fountains and rapidly moving lava flows called?

• Pele’s Hair

• Tephra

• Volcanic Ash

• Lava Rocks

What is the reduction in global temperatures caused by volcanic ash and droplets of sulfuric acids and water obscuring the sun called?

• Volcanic Winter

• Global Cooling

• Ash Fall

• Climate Change

Name two features of eruptions that are dangerous to life.

How would a volcanic eruption impact climate change?

Label the parts of a volcano:

a

b

c

d

Magma chamber

Throat

Main vent

Secondary vent

List and explain two reasons why volcanoes erupt?