Q 01/05

Crater Lake National Park is in which US state?

A) Oregon

B) Washington

C) California

D) Idaho

Answer · why

A) Oregon

Oregon. Crater Lake is the state's only national park, and it exists because one man, William Steel, campaigned for 17 years to have the lake protecte...

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

Mount Mazama, a stratovolcano in the southern Cascades, grew over hundreds of thousands of years before its summit collapsed into the emptied magma ch...

Q 03/05

How deep is Crater Lake at its deepest point?

A) About 200 feet

B) About 600 feet

C) About 1,900 feet

D) About 6,000 feet

Answer · why

C) About 1,900 feet

About 1,900 feet. The Park Service gives 1,943 feet and a 2000 sonar survey found 1,949, the deepest of any lake in the United States, because the col...

Q 04/05

How is Crater Lake refilled, with no streams flowing into it?

A) By hot springs on its floor

B) By an underground river system

C) By meltwater from a glacier

D) Entirely by rain and snow falling on it

Answer · why

D) Entirely by rain and snow falling on it

Entirely by rain and snow falling on it, the lake is kept at a nearly constant level because evaporation and seepage balance the precipitation; with n...

Q 05/05

Roughly how long ago did the eruption and collapse that created Crater Lake's caldera take place?

A) About 770 years ago

B) About 7,700 years ago

C) About 77,000 years ago

D) About 7 million years ago

Answer · why

B) About 7,700 years ago

About 7,700 years ago (around 5700 BC) the volcano's climactic eruption emptied its magma chamber and the summit collapsed; ash from the blast forms a...