What seven-letter word has hundreds of letters in it?

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

10+10 and 11+11 can give you the same answer.

Explain how?

What's the best place to go shopping in the ocean?

The answer I give is yes, but what I mean is no. What was the question?

I cannot talk, but I always reply when spoken to. What am I?

Which alphabet letter is a question?

81 x 9 = 801. What must you do to make the this equation true?

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?

What is the centre of gravity?