SOLAR SYSTEM

Detailed explanation-1: -All terrestrial planets in the Solar System have the same basic structure, such as a central metallic core (mostly iron) with a surrounding silicate mantle.

Detailed explanation-2: -The inner planets are closer to the Sun and are smaller and rockier. The outer planets are further away, larger and made up mostly of gas. The inner planets (in order of distance from the sun, closest to furthest) are Mercury, Venus, Earth and Mars.

Detailed explanation-3: -The four inner terrestrial planets are dense compared to the four outer planets. The inner planets are made up mainly of dense, solid rock. The outer planets are composed primarily of gas, so their overall density is lower.

Detailed explanation-4: -The heavier rocky and metallic materials are better suited to condense at higher temperatures. Thus, the inner planets are made almost entirely of rock and metal and form the group known as the terrestrial planets.