Why earthworms, snails, snakes appear on earth after a heavy rain fall ?

A girl riding a bicycle with a speed of 5m/s towards north direction, observer rain falling vertically down. If she increass her speed to 10 m//s, rain appear to meet her at 45^@ to the vertical. What is the speed of the rain?

There is a myth that immediately after heavy rains in forests, mushrooms appear in large number and make a very large ring or cirle, which may be several metres in diameter. These are called as 'Fairy rings'. Can you explain this myth of fairy rings in biological terms?

What happens to water which falls on the earth in the form of snow and rain ?

Why we see a rainbow just after rains?

Molecules in air in the atmoshpere are attracted by gravitational force of the earth. Explain why all of them do not fall into the earth just like an apple falling from a tree.