Fog form when a cloud touches the ground. Fog is usually formed when you have alot of humidity in the air. Alot of times, you have a hard time seeing in the front you. Fog can form and it can dissolve just as quickly. The same cloud that is not fog on lower ground may be fog where it contacts higher ground such as hilltops or mountain ridges (http://en.wikipedia.org/wiki/Fog). The foggiest place in the world is the Grand Banks off the island of Newfoundland, Canada (http://en.wikipedia.org/wiki/Fog).
Hail is basically ice. Hail is usually small, but can be big when coming from a severe thunderstorm. There needs to be a strong updraft in a thunderstorm for it to produce hail. Hail can do alot of damage to your house, car. Hailstones on Earth usually consist mostly of water ice and measure between 5 and 50 millimetres in diameter, with the larger stones coming from severe thunderstorms (http://en.wikipedia.org/wiki/Hail).
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