Originally posted by Man of Violence
9 times out of 10 the rocks in the wild are heavier. Rocks are formed through the gradual accumulation of sediment: for example, weather, sand on a beach or mud on a river bed. As the sediment is buried it is compacted as more and more material is deposited on top. Eventually the sediment will become so dense that it is essentially rock. This process is known as lithification.In the wild sediments can collect for billions of years at a high rate with no interference, billions of years of formation and collection. In human enviroments due to polution "Human interference in the lithification process" will slow or hault the process, making the rock smaller or less dense. Simple logic.
I hope you realize that doesn't change his point about the feat itself. Hint: there's no real evidence that the boulder was "ZOMG SO HE@VY!!!!1"