Q 01/05

Lassen Peak is the southernmost active volcano of which mountains?

A) Sierra Nevada

B) Coast Ranges

C) Cascades

D) Klamaths

Answer · why

C) Cascades

Cascades. The chain's southern end has crept north through time: three million years ago its last active volcanoes stood nearly 20 miles south of Lass...

Q 02/05

Lassen Peak is one of the world's largest examples of which type of volcano?

A) Shield volcano

B) Plug dome

C) Cinder cone

D) Stratovolcano

Answer · why

B) Plug dome

Plug dome. Its lava was too stiff to flow away and piled up over the vent into a steep mound; the other three types all stand elsewhere in the park.

Q 03/05

What did visitors report about the 30-ton boulder swept down by Lassen Peak's 1915 mudflow?

A) It glowed in the dark

B) It rang like a bell

C) It stayed hot to the touch

D) It hissed in the rain

Answer · why

C) It stayed hot to the touch

It stayed hot to the touch. The boulder had sat in the volcano's vent before the mudflow carried it down, and it has been called Hot Rock ever since.

Q 04/05

Which taller volcano stands north of Lassen Peak?

A) Mount Whitney

B) Mammoth Mountain

C) Medicine Lake Volcano

D) Mount Shasta

Answer · why

D) Mount Shasta

Mount Shasta. Eruption after eruption built it to more than 14,000 feet, while Lassen Peak, at about 10,450 feet, rose in a single short burst.

Q 05/05

What supplies the heat for Lassen's volcanoes?

A) A mantle hot spot like Hawaii's

B) Two plates sliding past each other

C) An ocean plate sinking under the continent

D) A rift pulling the crust apart

Answer · why

C) An ocean plate sinking under the continent

An ocean plate sinking under the continent. As the slab descends off the Northern California coast it generates the magma that feeds the whole chain o...