Mt. St. Helens

What is the name of the volcano that erupted in 1980, causing significant devastation?

• Mount Rainier

• Mount Hood

• Mount Mazama

• Mount St. Helens

What natural feature formed as a result of Mount Mazama's eruption?

• Crater Lake

• Yellowstone Lake

• Spirit Lake

• Lake Tahoe

How many years did Mount St. Helens remain dormant before its 1980 eruption?

• 100 years

• 150 years

• 123 years

• 75 years

What was the time of the earthquake that initiated Mount St. Helens' 1980 eruption?

• 8:32 a.m.

• 9:15 a.m.

• 10:00 a.m.

• 7:45 a.m.

Which city became a ghost town due to volcanic ash from Mount St. Helens?

• Seattle

• Yakima

• Spokane

• Portland

What phenomenon did Mount St. Helens create that affected visibility and transportation?

• Ash clouds

• Lava flows

• Snow storms

• Mud flows

How deep is the lake that formed in the caldera of Mount Mazama?

• About 4000 feet

• About 5000 feet

• About 3000 feet

• About 2000 feet

What is the name of the emerging volcanic cone of a reborn Mount Mazama?

• Mystic Island

• Wizard Island

• Dragon Island

• Phoenix Island

Which river's valleys were filled with massive flows of debris from Mount St. Helens?

• Toutle River

• Columbia River

• Chehalis River

• Snake River

What was the height of the ash clouds produced by Mount St. Helens during its 1980 eruption?

• 10 miles

• 12 miles

• 14 miles

• 16 miles