All about Volcanoes(Video from Volcanoes 101 National Geographic

About how many active volcanoes are there around the world?

• 1,500

• 1,200

• 1,550

• 15,000

What percent of volcanoes does the ring of fire contain?

What are the major types of volcanoes?

• Stratovolcanoes

• Shield Volcanoes

• Mid-ocean Ridges

• Pyramid Volcanoes

• Calderas

Stratovolcanoes are tall steep mountains.

• False

• True

What shape are shield volcanoes?

• Tall and Steep

• Flat and Dome shaped

• Bulky and Cylindrical

• Short and Dome shaped

What are calderas?

• Large depressions in the ground

• Small depressions in the ground

• Cracks in the ground

• Holes in the ground

Up to what temperate in Fahrenheit can lava reach?

When does pyroclastic flow occur?

• When searing hot gas form through the mantle

• When the lava reaches a boiling point and overflows

• After the volcano erupts

• Before the Volcano erupts

At what speed in mph does pyroclastic flow occur

• 100mph

• 150pmh

• 200mph

• 300mph

What is the index that scientists developed to be able to classify and measure eruptions called?