I thought heavy elements like iron & gold were dense & sank into the interior of the molten planet? How did gold get on top of the less dense crust?

If it is denser then water it shall float  but if water has a higher density the object sinks

Explanation:

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.