Ok, it might not be terribly hard or all that good, but I want to see if I can fool somebody......here goes.
***
Riddle by Tony
It lays unmoving throughout the days
Although it is hit by the unbearable rays
It goes for miles, and continues on
Its purpose often wondered upon.
It seems as if unable to hold
Yet able to be many centuries old
It covers not all but most of the land
Though it can slip right out between your hands.
***
I know it's bad but i had it for a while and decided to post it 
Anyway, thanx for reading my attempt at a riddle. And struggling through my horrible forced rhyming.
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not true, it does not cover most orf the land.
Ha! I got sand too **looks smug** LMAO. Anyway, cant really critique it as a poem - because it's a riddle - but I will make a few general points:
It lays unmoving throughout the days -- it LIES
Although it is hit by the unbearable rays -- I'd take away "the" before "unbearable"
It goes for miles, and continues on
Its purpose often wondered upon. -- hehe this makes me laugh.
It seems as if unable to hold -- "it seems as if it's unable to hold" is better, although it's still weird. Hold what?
Yet able to be many centuries old
It covers not all but most of the land
Though it can slip right out between your hands. -- "yet it can slip from between your hands" may fit better.
Still, cute as a riddle. Short, funny and you managed to fool 2 ppl, so who's complaining? Heheh
Hahah! That was one of my first thoughts!
... but my sister was using the computer at the time soOo...
its sand
yeah, i think it's water.
not that bad.
could cut out a few useless lines, though
the ocean
(if i got it right it is too simple-i got it before i even finished reading it)