premise: when a hemisphere is tilted away from the sun , that hemisphere receives less direct sunlight sent2: summer is when a hemisphere is tilted towards the sun sent3: the northern hemisphere is a kind of hemisphere of earth sent4: when a hemisphere is tilted towards the sun , that hemisphere receives more direct sunlight sent5: winter is when a hemisphere is tilted away from the sun sent6: receiving direct sunlight causes objects to become warm.
hypothesis: a change in air temperature can cause water to change from one state of matter into another state of matter