SOLAR SYSTEM

Detailed explanation-1: -Terrestrial planets form Planets also formed by the merging of planetesimals in the inner part of the main disk, near the young Sun. These were composed primarily of elements that resist vapor-ization, so the inner planets are rocky and dense, in contrast to the gaseous outer planets.

Detailed explanation-2: -For starters, the inner planets are rocky and terrestrial, composed mostly of silicates and metals, whereas the outer planets are gas giants. The inner planets are also much more closely spaced than their outer Solar System counterparts.

Detailed explanation-3: -The planets Mercury, Venus, Earth, and Mars, are called terrestrial because they have a compact, rocky surface like Earth’s terra firma. The terrestrial planets are the four innermost planets in the solar system.

Detailed explanation-4: -The giant planets are less dense overall because they are made mainly of gases, and the inner rocky planets are more dense because they are made mainly of rock.

Detailed explanation-5: -Saturn: Water in frozen and vapour form. Uranus: Frozen water. Neptune: Frozen water.