Question 1
Which of the following best describes Shiprock, a famous volcanic feature in New Mexico?
◦ a very recently active, basaltic cinder cone
◦ an extinct, massive, rhyolitic shield volcano
◦ the eroded remains of a volcanic pipe and radiating dikes
◦ an extinct, highly symmetrical, composite volcanic cone
Question 2
What volcanic events formed Crater Lake, Oregon? When did they take place?
◦ A powerful explosion blew away the top of a stratovolcano 10 million years ago.
◦ The crater of a large, extinct cinder cone filled with water 5 million years ago.
◦ Caldera collapse followed major ash and pyroclastic-flow eruptions 6000 years ago.
◦ Landslides and volcanic mudflows dammed the Mazama River 500 years ago.