2. Hail

Hail is a form of precipitation which consists of balls or irregular lumps of ice formed in convective clouds. When water vapor rises up with the air current it will be cooled down and condense into small water drops. If the altitude continues to increase, the temperature will further decrease and when it reaches below 0 °C water drops will become ice cubes. When an ice cube rises, it will absorb other small ice cubes or water drops and become bigger. And when the updraft can no longer carry its weight it will begin to fall. When it falls over a region of higher temperature, its surface will melt and become water, which enables it to absorb surrounding water drops. If there is another strong updraft to carry it up again, the ice cube's surface will once again freeze. Repeating this process, the size of the ice cube will grow until it reaches a point when it becomes heavier than the air buoyancy and will fall to the ground. If it is still in the form of ice when it reaches the ground it will be called hail, if it has melted into water then it is common rain.