I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

I’m tall when I’m young, and I’m short when I’m old. What am I?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

I shave every day, but my beard stays the same. What am I?

I add 5 to 9 and get 2. The answer is correct, so what am I?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?