Which four planets are classified as terrestrial planets in our solar system?

The classification of planets in our solar system is based on their physical characteristics and composition. The terrestrial planets are those that are primarily composed of rock and metal, which distinguishes them from the gas giants.

Mercury, Venus, Earth, and Mars are recognized as the terrestrial planets because they have solid surfaces, are relatively small in size, and have a higher density compared to the gas giants. These planets have features such as mountains, craters, and valleys, and they are closest to the Sun, which affects their temperature and atmospheric conditions.

In contrast, the other choices include gas giants like Jupiter, Saturn, Uranus, and Neptune, which do not have solid surfaces and are primarily made up of hydrogen and helium, with thick atmospheres and deep layers of gas. Therefore, recognizing Mercury, Venus, Earth, and Mars as terrestrial planets provides a clear understanding of their composition and surface characteristics that differentiate them from the other types of planets in our solar system.