The sun's heat allows water to change forms from liquid to gas to ice and back again.
(The sun's heat; allows; water to change forms from liquid to gas to ice and back again) Context(The sun 's heat allows,List([0, 21))):(water; to change; forms from liquid to gas to ice and back again)
The sun 's heat allows,List([0, 21))
The sun's heat water
allows to change
water to change forms from liquid to gas to ice and back again
forms from liquid to gas to ice and back again