Processes Shaping Terrestrial Worlds

Processes shaping terrestrial worlds include comparative planetology, which examines past planetary processes such as condensation, accretion, differentiation, outgassing, and solidification of crust. Notably, heavy bombardment and cratering affect all studied bodies, with flooding observed on Earth, the Moon, and Mars. Current processes involve ongoing impact cratering on Mercury, Venus, Earth, and Mars, tectonic activities historically present on Mercury, Earth, and Venus, and past volcanism on these same bodies. Gradation, requiring liquid or atmosphere, occurs on Earth and Venus. Geologically, tidal heating affects Jovian moons. Key differences between terrestrial and Jovian bodies include size (small bodies can't retain light gases, leading to atmospheric differences) and temperature influences, where inner temperature is size-dependent while surface temperature varies with solar distance and other factors, particularly greenhouse effects on Venus.