Period of the rotation in Earth days
Period of revolution in Earth years
Average distance from the sun
how far from the sun
Mercury mad up of
2) Mercury is too little and has too little gravity to hold onto an atmosphere.
3) Mercury's crust is too thick and hard that no volcanic activity can go through the surface of the planet.
4) Mercury's core make up almost 75% of the planet.
5) Mercury is the smallest planet.