Which of the following is true about terrestrial planets?

Which of the following is true about terrestrial planets?

• A. They have thick atmospheres
• B. They are made mostly of gas
• C. They are primarily composed of rock and metal
• D. They have no moons

Answer: (C)

The assertion that terrestrial planets are primarily composed of rock and metal is accurate. Terrestrial planets, which include Mercury, Venus, Earth, and Mars, are characterized by their solid, rocky surfaces. This composition allows them to have a definite structure compared to gas giants, which are made mostly of gases and lack a solid surface. The defining characteristics of terrestrial planets include their density, which is higher due to the presence of metals and minerals, and their formation under conditions that allowed for the accumulation of heavier materials closer to the Sun. This composition is essential for understanding the geology, atmosphere, and potential for life on these planets. In contrast, thick atmospheres are more commonly associated with gas giants like Jupiter and Saturn. The notion that terrestrial planets are made mostly of gas is incorrect, as their solid structure is a key differentiator. Additionally, while some terrestrial planets do have moons, not all do; Mercury and Venus, for example, have none.

The assertion that terrestrial planets are primarily composed of rock and metal is accurate. Terrestrial planets, which include Mercury, Venus, Earth, and Mars, are characterized by their solid, rocky surfaces. This composition allows them to have a definite structure compared to gas giants, which are made mostly of gases and lack a solid surface.

The defining characteristics of terrestrial planets include their density, which is higher due to the presence of metals and minerals, and their formation under conditions that allowed for the accumulation of heavier materials closer to the Sun. This composition is essential for understanding the geology, atmosphere, and potential for life on these planets.

In contrast, thick atmospheres are more commonly associated with gas giants like Jupiter and Saturn. The notion that terrestrial planets are made mostly of gas is incorrect, as their solid structure is a key differentiator. Additionally, while some terrestrial planets do have moons, not all do; Mercury and Venus, for example, have none.