they are different because the earth has a hot molten core which drives convection between the surface and the core. This convective movement breaks the crust up into slabs which crunch into one another in slow motion, driving the creation and continuous renewal of mountain ranges and valleys via a process called plate tectonics. No plate tectonic processes are active on the moon.
In addition, the moon is too small for its gravity to hold onto gas and water vapor, so the moon has no atmosphere, no clouds, no rivers, no oceans and no lakes. This in turn means that the flowing water processes that shape the landscape on earth are absent on the moon, and with no water or oxygen, terrestrial life cannot exist on the moon.