Rocky
Mercury is a rocky planet.
It is a rocky planet.
Mercury is a rocky planet. The inner planets (first four planets from the sun) are rocky planets (which means that you could stand on them) and are the smallest. While the outer planets (last four planets from the sun) are gas planets and the biggest.
Mercury is the closest planets to the sun, and is `rocky` so is also the closest rocky (or terrestrial) planet.
Mercury is the smallest "rocky" planet.
Mercury is the smallest rocky planet and closest to the sun in our solar system.
It is a rocky planet.
Mercury .
The element Mercury is liquid at STP. The planet Mercury is a rocky or terrestrial type planet.
Mercury is one of the rocky planets.
Mercury is a rocky planet.It's actually a rock because it is one of the inner planets that are all made of rock.The planet Mercury is a dense, rocky, airless world.