The Ring Of Fire

Where did the 1980 eruption of Mt. St. Helens take place?

• Alaska

• Hawaii

• California

• Washington

What caused the northern side of Mt. St. Helens to slide down the hill?

• Earthquake

• Tornado

• Hurricane

• Flood

What is the Ring of Fire?

• A giant ring around the Atlantic Ocean

• A giant ring around the Arctic Ocean

• A giant ring around the Indian Ocean

• A giant ring around the Pacific Ocean

What are tectonic plates?

• Pieces of ice in the ocean

• Layers of clouds in the sky

• Large plates of Earth's crust

• Small rocks on the Earth's surface

What is magma?

• Metal

• Frozen water

• Sand

• Super hot rock that can flow like water

What causes pressure in the magma chamber to rise?

• Cooling of the magma

• Increase in tectonic plate movement

• Release of gas and water

• Decrease in tectonic plate movement

What happens when the volcano erupts explosively?

• The magma and hot gas are contained below the earth's surface

• The volcano becomes dormant

• The magma and hot gas escape into the atmosphere

• The volcano collapses

What is the temperature of magma?

• Less than 100°F

• Around 500°F

• More than 1650°F

• Around 1000°F

Where are most active volcanoes and earthquakes found in the United States?

• South

• East Coast

• Midwest

• West Coast

How many volcanoes are there in the Ring of Fire?

• 600

• 200

• 300

• 452