If your asking what causes hail here it is.

if you have a cold air mass the warm air will freeze rapidly and lose its water in the form of rain. if the cold air is cold enough or high enough in the atmosphere, the rain will freeze and fall to the ground as ice this is hail.
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Actually that's not what he meant. Weathering means Corroding of certain substances. :)
OK!!!!! TY;)
Its not really Freezing water. Its when water from the rain seeps in the cracks of the rocks. Then slowly after a period of time freezing, causing the rock to corrode from the inside and breaks into pieces. :)