Kids Riddles

I am the fastest animal but cannot climb the tree. What am I?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

What jumps when it walks and sits when it stands?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

How many letters are in the alphabet?