Please choose the correct answer to the question: A student is investigating changes in the states of matter. The student fills a graduated cylinder with 50 milliliters of packed snow. The graduated cylinder has a mass of 50 grams when empty and 95 grams when filled with the snow. The packed snow changes to liquid water when the snow is put in a warm room. Which statement best describes this process?

Answer1: Cooling causes the snow to melt. Answer2: Cooling causes the snow to freeze. Answer3: Heating causes the snow to freeze. Answer4: Heating causes the snow to melt.

Answer format: answer1/answer2/answer3/answer4