| All the Moon's multi-ringed impact basins are older than the Moon's second kind of crust, consisting of basalts that have flooded low-lying areas to form the lunar maria. |
| We had some idea there were compositional variations, because we could see differences in brightness between the smooth maria and the highlands. |
| However, Maria is adamant that gender has never been an issue in her career. |
| It must have happened before the visible maria formed, because they are not covered or scoured by the materials ejected from the huge craters. |
| Most of the Moon's iron-rich basalt maria occur on the near side as well, where they alternate with highlands having only moderate concentrations of iron. |
| In this guarded fashion the claim that the seas of the world outside Europe were Iberian maria clausa was breached. |
