Q 01/05

Crater Lake National Park is in which US state?

A) Oregon

B) Washington

C) California

D) Idaho

Answer · why

A) Oregon

It is the state's only national park and, established in 1902, the fifth-oldest in the country.

Q 02/05

Crater Lake fills the caldera of which collapsed volcano?

A) Mount Hood

B) Mount Mazama

C) Mount Thielsen

D) Mount McLoughlin

Answer · why

B) Mount Mazama

The mountain once stood around 12,000 feet, which would have made it the state's highest peak; the Klamath called it Tum-sum-ne.

Q 03/05

How deep is Crater Lake at its deepest point?

A) 949 feet

B) 2,949 feet

C) 1,949 feet

D) 4,000 feet

Answer · why

C) 1,949 feet

That makes it the deepest lake in the United States and the second-deepest in North America after Canada's Great Slave Lake.

Q 04/05

How is Crater Lake refilled, given that no streams flow into or out of it?

A) By hot springs on the lake floor

B) By an underground river from the Cascades

C) By snowmelt piped from Mount Scott

D) Entirely by rain and snow falling on it

Answer · why

D) Entirely by rain and snow falling on it

Water leaves only by evaporation and seepage, which is why the lake is among the purest and clearest on Earth.

Q 05/05

Roughly how long ago did the climactic eruption and collapse create the caldera?

A) About 77,000 years ago

B) About 7,700 years ago

C) About 770 years ago

D) About 7 million years ago

Answer · why

B) About 7,700 years ago

The blast was the largest in the Cascades in a million years and left a hole about 4,000 feet deep that took roughly 740 years to fill.