Is it explaining how when where or to what extent in the sentence Chocolate milk flew everywhere when the carton broke?

In the sentence "Chocolate milk flew everywhere when the carton broke," the Word "when" is functioning as a subordinating conjunction, introducing an adverbial clause that explains the timing of the action. The adverbial clause "when the carton broke" provides additional information about the circumstances surrounding the main action of chocolate milk flying everywhere. This type of clause is known as an adverbial clause of time, specifying the time at which the main action occurred.