What would happen if all of the world's oceans dried up???

If all the world's oceans dried up we would have very high temperatures which would cause pretty much all of the animals that call it home to become very dehydrated and eventually die. Marine animals are one of our very important food sources and without them I think all the sea food lovers would go crazy. A lot of the trees and plants would die because of there not being any rain due to no water evaporating within the clouds. If there were no clouds then it would allow more sun to come through and burn hotter than it does now and would cause many other things to die as well. Humans would have a hard time surviving because of there being no water in our atmosphere and would also become very dehydrated. If all the oceans dried up and these things did actually happen the earth would pretty much die itself and no longer exist.