Which of the following planets is not considered a gas giant in our solar system?

Earth is classified as a terrestrial planet rather than a gas giant. Terrestrial planets are composed mainly of rock and metal, and they have solid surfaces. Earth, along with others in its category, including Mercury, Venus, and Mars, features a variety of geological structures and is capable of supporting life due to its stable atmosphere, liquid water, and suitable range of temperatures.

In contrast, the gas giants—Jupiter, Saturn, and Uranus—are predominantly composed of gases such as hydrogen and helium, with no definitive solid surface. These planets have thick atmospheres and are characterized by their large sizes and lower densities. Jupiter and Saturn, for instance, are known for their extensive ring systems and numerous moons, while Uranus is noted for its unusual tilt and icy composition.

Thus, recognizing Earth as a terrestrial planet and distinguishing it from the gas giants provides clarity on the composition and characteristics of different types of planets in our solar system.