SOLAR SYSTEM

Detailed explanation-1: -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-2: -In our solar system, Earth, Mars, Mercury and Venus are terrestrial, or rocky, planets.

Detailed explanation-3: -Rocky planets are smaller than gas planets, but are made of heavier materials. There are four rocky planets in our Solar System: Mercury, Venus, Earth, and Mars. They are the closest planets to the Sun, and so are sometimes known as the inner planets.

Detailed explanation-4: -For example, the sizes of the inner planets are much smaller than those of the outer planets. This is because the outer planets are in a gaseous state while the inner planets are solid and more compact. Consequently, the density of the inner planets is greater than that of the outer planets.

Detailed explanation-5: -The four innermost planets in the Solar System (Mercury, Venus, Earth, and Mars) are sometimes called the “terrestrial” planets because of their proximity to Earth ("Terra” in Latin) and their similarity as compact solid bodies with rocky surfaces.