is the group of words in bold a phrase or a clause? although both are formed by mineral deposits in caverns…

is the group of words in bold a phrase or a clause? although both are formed by mineral deposits in caverns, stalactites are the formations that hang from the ceiling of the cave, whereas stalagmites build up from the ground. phrase clause
Answer
Brief Explanations:
A clause has a subject - verb combination. "stalagmites build up from the ground" has the subject "stalagmites" and the verb "build up". A phrase does not have a subject - verb combination. Since this group of words has a subject - verb pair, it is a clause.
Answer:
clause