How can a geologist determine whether a shield volcano is extinct?
A) It will have been completely washed away shortly after becoming extinct.
B) It will be carved by river or glacial valleys.
C) Something akin to Devil's tower will be exposed.
D) There will be no volcanic activity anywhere near the area.

Question

Quizplus · Accepted Answer

A geologist can determine whether a shield volcano is extinct by observing if the volcano has been carved by river or glacial valleys. Over time, erosion will break down the shield volcano and create valleys that carve into the structure. An extinct volcano will show signs of significant erosion, indicating it has not been active for a long period.

How Can a Geologist Determine Whether a Shield Volcano Is