1. What makes clouds snow?

When it is very cold the water in clouds freezes and forms the snow crystals. while falling these crystals in clouds  join with others and become snowflakes.

2. Why does the sky usually looks blue?

It is due to the phenomenon of 'the scattering of light'. Clear sky looks blue because the atmosphere reflects mainly blue lights and absorbs all other lights from the sun.

3. What are fog and mist?

Fog is a like cloud near the ground. It is composed of billions of tiny water droplets that floats in the air. They are basically the same things but the fog is litter thicker.It mostly occur when he skies are cloudless, the air damp and wind is light usually at night and sometimes lasts up to late morning.

Fog is seen when the atmospheric visibility near the Earth's surface is reduced to 1 kilometer or less.

4. What is smog?

The combination of fog and smoke is called 'smog', which mostly is seen in cities and industrial areas. This arises as the dust and  tiny particles from vehicle exhaust fumes and factory chimneys. Smog is harmful to people particularly suffering form asthma and other respiratory diseases.

5. What is EL Nino?

This is usually a sudden warming every few years of Pacific Ocean off the coast of South America. It spreads westwards and affects the weather on many countries. It is not yet fully understood.

 6. What is called 'Raining cats and dogs'?

There don't appear to be any reports to 'Raining cats and dogs'. However there are reliable evidences from different parts of the world of showers of fish, frogs, spiders, crabs and other creatures. As of a case seen on 16th Jun-1939 that a shower of tiny frogs fell on Trowbridge in England. It is supposed to be strong winds and waterspouts that can suck up a whole variety of things and drop them some distance place away.