Question

is the group of words in bold a phrase or a clause? usually the result of earthquakes or volcanic activity, tsunamis are enormous ocean waves that can devastate docked ships; meanwhile, ships at sea may not even detect the massive waves. phrase clause

Explanation:

A phrase is a group of words without a subject - verb combination, while a clause has a subject and a verb. The bolded part "usually the result of earthquakes or volcanic activity" has no subject - verb pair.

Answer:

phrase