Need help... Does anyone know what could have caused this????
 

I've asked everyone i know, and nobody has a clue as to what caused this. i was told that the whole head needs to be replaced. i don't know what's going on.... please help!!!!

Sorry dude this may be a stupid question but what is wrong?

there are those trails marked in the metal. and if you look closely one of the trails spread to the spark plug and kind of dug it out.

Was the engine burning coolant? Failed head gasket??