What is the definition of vulcanize?

Question

Responses

to strengthen rubber by heating it
to strengthen rubber by heating it

to beat, squeeze, or bend something until it becomes warm
to beat, squeeze, or bend something until it becomes warm

to throw something into a volcano
to throw something into a volcano

to explode up and outward like a volcanic eruption

Answer 1

The definition of vulcanize is "to strengthen rubber by heating it."