Which planets are classified as terrestrial planets?

The classification of terrestrial planets includes Mercury, Venus, Earth, and Mars due to their similar characteristics. Terrestrial planets are primarily composed of rock and metal, possess solid surfaces, and have relatively smaller sizes compared to gas giants. They are located in the inner part of the solar system, closer to the Sun, which affects their physical and atmospheric properties.

Mercury, the closest planet to the Sun, has a thin atmosphere and no significant weather, while Venus is known for its thick, toxic atmosphere and extreme greenhouse effect. Earth, being the only planet known to support life, has a diverse atmosphere and abundant water. Mars, often referred to as the "Red Planet," has a rocky surface with iron oxide, giving it its reddish appearance, and it shows evidence of past water activity.

In contrast, the other options contain planets that either belong to the gas giant category or are dwarf planets. This distinction clarifies why the correct choice focuses specifically on the characteristics that define terrestrial planets.