An extinct volcano is one that:a. existed during a past ...

[EY67]

An extinct volcano is one that:a.
   existed during a past geological period or epoch.
  b. has not erupted during recorded history.
  c. has shown no evidence of activity over recorded history.
  d. has not erupted during recorded history and has shown no evidence of activity over
  recorded history.
  e. all of these.

Question 2

One indicator of an impending volcanic eruption that precedes all Hawaiian volcanic eruptions is a
  continuous ground motion called ___________________ _. Fill in the blank(s) with the appropriate word(s).

[phuda]

Answer to Question 1

D

Answer to Question 2

volcanic tremor
harmonic tremor

[EY67]

Excellent

[JaynaD87]

Thanks for the timely response, appreciate it