Uluru or Ayers Rock is the largest and heaviest rock in the world.
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The heaviest naturally occurring rock is iron meteorite, with an average density of around 7,800 kg/m^3. It is denser and heavier than most terrestrial rocks.
It is 7th. (Strictly speaking you should say most massive, not heaviest.)
Jupiter is the heaviest planet in our solar system, with a mass of approximately 318 times that of Earth.
It depends on the composition, iron is the most common, and is the heaviest.
Uub and Uuq are listed on most periodic tables as the heaviest elements. (You can check the number at the bottom of the box, that is its atomic mass or weight
Gold is the most dense of these elements