Which of these rocks forms under the most extreme conditions of heat and pressure?

metamorphic rocks

Extra: crystals can form, various minerals in the rock can come together to form new minerals.

explanation: the line "to save the day, harry must get past a scary three-headed guard dog" from the summary best justifies the conclusion that harry potter and the sorcerer’s stone was influenced by ancient greek mythological literature. the three other choices had nothing to do with ancient greek literature - and the words "three-headed guard dog" are what makes that choice the correct answer.

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explanation:

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fr