Why is a river so rich ?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

What part of the chicken has the most feathers?

What can jump higher than a building?

Through your logical capabilities, can you make 7 an even?

What can go up a chimney down, but can’t go down a chimney up?

What do you call a fish without an eye?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

Do you know who was buried in John's tomb?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?