Answer:
Because they are relatively small in size
Explanation:
Geological activity can be explained as the movement of irregularly shaped slab of solid rocks, known as tectonic plates beneath the surface of the earth. It has been discovered that , this geological activity is present because of heat.
In Jovian moons, it has been discovered that , geological activity is present not only because of the tidal heat, but also because of their shapes, i.e composition.
Some of the evidences of the geological activity which have been observed in the Jovian moons include
* Active volcanoes
* Ice crystals being sprayed out into space
* Surfaces with very few impact craters.
Earth's mantle has kept contributing to the Earth's atmosphere through a process called degassing. During this process, gases are emitted from the magma in the mantle and are transferred into the atmosphere through tectonic procedure such as ocean ridge spreading and volcanism.
