During the water cycle, cloud formation begins after the of water and occurs during the
of water.

i think it is true since you can test the answer and can use observations to complete it.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter  

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.