It contains a biosphere.
It is rocky with craters.
1/4
It is the surface of the earth, except it is under water instead of under air.
The road surface ahead changes from a hard-surfaced pavement to a low-type surface or earth road.
The most common unique about earth to other planets is that Earth have life.
The planet Earth is the only planet which we know to contain life. There may be others, but we have not found them yet. So for now, Earth is unique.
octahedron
Surfaced
Humans can live on it
I live on it! :)
An octahedron.
Earth is the only planet currently known to have life.