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To form, this type of precipitation requires an environment where raindrops develop in an atmosphere where air temperature is above freezing.These raindrops then fall into a lower layer of air with freezing temperatures.
Ice pellets have a diameter less than 5 millimeters.
Because they have a large charge, alpha particles ionise other atoms strongly.
Beta particles have a charge of minus 1, and a mass of about 1/2000th of a proton.
A dome-shaped glacier covering an area greater than 50,000 square kilometers.
Greenland and Antarctica are considered ice sheets.
In this lower layer of cold air, the raindrops freeze into small ice pellets.