Gas planets such as Jupiter have no crust as they are made primary of hydrogen and helium rather than rock. A terrestrial planet without a crust would not be all that different from a planet with a crust as the difference between the crust and the mantle of a planet has more to do with chemical composition than anything else.
The existence or not of an outer rocky crust above a rocky mantle. A gas planet has no crust.
Mars
No. The crust is the outermost solid layer of a planet or moon.
Its called the crust.
Mars
The planetary surface or crust.
Mars is the planet that has iron oxide in its crust, giving it its reddish color. This iron oxide, commonly known as rust, gives Mars its nickname "the Red Planet".
Erosion happens in the earths crust and it happens because of that layer is exposed to that weather
The thin crust of the planet floats on the molten core.
Trench
Mars
The crust.