"What am I" Riddles

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

I make two people out of one. What am I?

My life can be measured in hours, I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe. What am I?

I am white when I am dirty, and black when I am clean. What am I?

This is as light as a feather, yet no man can hold it for long. What am I?

I am taken from a mine, and shut up in a wooden case, from which I am never released, and yet I am used by almost everybody. What am I?

The more you take away, the more I become. What am I?

I have two hands, but I can not scratch myself. What am I?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Always in you, sometimes on you. If I surround you, I can kill you. What am I?

I have no feet, no hands, no wings, but I climb to the sky. What am I?

I can be cracked, I can be made. I can be told, I can be played. What am I?

I am a word of six. My first three letters refer to an automobile.
My last three letters refer to a household animal.
My first four letters make a fish.
My whole is found in your room.
What am I?

There was a green house. Inside the green house there was a white house Inside the white house there was a red house. Inside the red house there were lots of babies. What am I?

I'm white, and used for cutting and grinding.
When I'm damaged, humans usually remove me or fill me.
For most animals I am a useful tool.
What am I?

I am enjoyed by some, despised by others.
Some take me for granted, some treasure me like a gift.
I last forever, unless you break me first.
What am I?

I make two people out of one. What am I?

What is full of holes but still holds water?

Turn us on our backs and open up our stomachs, and you will be the wisest but at the start a lummox.
What are we?

I never was, am always to be.
No one ever saw me, nor ever will.
And yet I give confidence to all,
Who live and breathe on this terrestrial ball.
What am I?

I go up but never come back down? What am I?

Forward I am heavy, but backward I am not. What am I?

Poor people have it. Rich people need it. If you eat it you die. What am I?

It's shorter than the rest, but when you're happy, you raise it up like it's the best. What is it?

I will always be coming, but I will never come. What am I?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

Never ahead, ever behind, yet flying swiftly past; for a child, I last forever; for an adult, I'm gone too fast. What am I?

You can break me easily without even touching me or seeing me. What am I?

You can easily touch me,
But not see me.
You can throw me out,
But not away.
What am I?

I have billions of eyes, yet I live in darkness.
I have millions of ears, yet only four lobes.
I have no muscle, yet I rule two hemispheres.
What am I?