text: Also , lunar samples do not have expected ratios of volatile elements , iron oxide , or siderophilic elements , and there is no evidence to suggest that the Earth ever had the magma ocean implied by this hypothesis .
simplified: Also , lunar samples do not have expected ratios of volatile elements , iron oxide , or siderophilic elements ( chemical elements which bond with iron ) , and there is no evidence that the Earth ever had the magma ocean implied by the hypothesis .