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: -The four rocky planets are Mercury, Venus, Earth and Mars. They are the closest four planets to the Sun. They are made of rocks and metals. They have a solid surface and a core which is mainly made of iron.

Detailed explanation-3: -Terrestrial planets are planets made up of rocks or metals with a hard surface-making them different from other planets that lack a solid surface. Terrestrial planets also have a molten heavy metal core, few moons, and landforms such as cliffs, valleys, volcanoes and craters.

Detailed explanation-4: -The temperature of the early solar system explains why the inner planets are rocky and the outer ones are gaseous. As the gases coalesced to form a protosun, the temperature in the solar system rose. In the inner solar system temperatures were as high as 2000 K, while in the outer solar system it was as cool as 50 K.

Detailed explanation-5: -The four innermost planets are referred to as terrestrial planets and have characteristics like liquid heavy-metal core, at least one moon, and valleys, volcanoes, and craters. These are all Earth-like features; thus, Earth is a terrestrial planet.