What is the centre of gravity?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Different lights make me strange by changing me into different sizes. What am I?

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

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

I am quite hot but become too cold if you remove the first two letters. What am I?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

Can you name four days which start with the letter 'T'?