Will give brainliest, i might have more later

Which of the following are forms of phase changes a. freezing b. condensation c. heating d. exchanging

Is a volume of space that is empty of matter.

If you visited mount shasta city (elevation 900 m [3000 ft.]) and found the outside air temperature to be 27°c (81°f), what would be the air temperature at the summit of mount shasta (elevation 4200 m [14,000 ft.]) at that moment-assuming that the temperature conditions with altitude change at an average, or normal, lapse rate?