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?

  Options: 
 A. Cooling causes the snow to melt.
 B. Cooling causes the snow to freeze.
 C. Heating causes the snow to freeze.
 D. Heating causes the snow to melt. 
Answer: D