Riddles

For hundreds of years riddles were used to test speed of thought and basic logical processes. I now offer you the following riddle to test your knowledge.

Easy
 
Medium
 
Hard
Give it food and it will live;
give it water and it will die.
The more you take, the more you leave behind.
You use a knife to slice my head,
and weep beside me when I am dead.
Light as a feather,
there is nothing in it;
yet the strongest man can't hold it
for much more than a minute?
Twelve white ponies,
On a red hill,
Always moving,
but standing still.
What are we?
What eats rocks, levels mountains,
rusts metal, pushes the clouds across the sky,
and can make a young man old?
What builds up castles,
Tears down mountains,
Makes some blind,
And helps others to see?
Born Motherless and Fatherless,
Into this world without a sin
Made a loud roar as I entered
And never spoke again.
Through wind and rain I always play,
I roam the earth, yet here I stay;
I crumble stones, and fire cannot burn me;
Yet I am soft-
you can gauge me with your hand.
Pernounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I'm double, Im single,
I'm black, blue, and grey,
I'm read from both ends,
And the same either way.
Only two backbones, a thousand ribs.
I am the black child of a white father,
a wingless bird,
flying even to the clouds of heaven.
I give birth to tears of mourning in pupils that meet me,
even though there is no cause for grief,
and at once on my birth
I am dissolved into air.
A word I know, Six letters it contains,
Subtract just one, And twelve is what remains.
It has no top or bottom
but it can hold flesh, bones and blood
all at the same time.
What is this object?
There is a thing that nothing is,
and yet it has a name.
It's sometimes tall and sometimes short,
joins our talks and joins our sports,
and plays at every game?
A little pool with two layers of wall around it.
One white and soft and the other dark and hard,
amidst a light brown grassy lawn
with an outline of a green grass.
Walk on the living,
they don't even mumble.
Walk on the dead,
they mutter and grumble.
I am emeralds and diamonds,
Lost by the moon.
I am found by the sun,
And picked up real soon.
As I walked along the path
I saw something with four fingers and one thumb,
but it was not flesh, fish, bone or fowl.
With no wing, I fly
With no eyes, I see
With no arms, I climb
More frightening than any Beast,
Stronger than any foe.
I am cunning, Ruthless, and tall
In the end; I rule all.
I went to the woods and got it,
I sat down to seek it,
I brought it home with me because I couldn't find it.
I am both Mother and Father.
I am seldom still,
yet I never wander.
I never birth nor nurse.
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.
The beginning of eternity,
The end of time and space,
The beginning of every end,
And the end of every place.
Runs over fields and woods all day,
Under the bed at night sits not alone,
With long tongue hanging out,
A-waiting for a bone.
I never was, am always to be,
No one ever saw me, nor ever will,
And yet I am the confidence of all,
To live and breathe on this terrestrial ball.
At night they come without being fetched,
And by day they are lost without being stolen.

** Special thanks go to Birdman for his help with this page. **