Examkin

Question

Difficulty: MediumThe Solar System and Planets

Planets in our solar system are broadly categorized into terrestrial planets and gas giants based on their physical and compositional properties. Which of the following characteristics is typical of terrestrial planets when compared to gas giants?

  1. A
    Thick atmospheres composed primarily of hydrogen and helium
  2. Higher average density and a solid rocky surfaceAnswer
  3. C
    Prominent planetary ring systems and rapid axial rotations
  4. D
    Significantly larger diameters and dozens of orbiting moons

Answer

Higher average density and a solid rocky surface
Terrestrial planets (Mercury, Venus, Earth, and Mars) are formed from rocky and metallic materials, resulting in higher average densities and solid surfaces compared to the gaseous, low-density outer planets.

Step-by-Step Solution

1
Identify the primary structural and chemical makeup of terrestrial planets.
Terrestrial planets (Mercury, Venus, Earth, and Mars) consist predominantly of silicate rock and metallic cores.
Establishing the elemental composition of inner planets reveals their high density and solid crust.
2
Compare terrestrial characteristics with the properties of gas giants.
Gas giants (Jupiter, Saturn, Uranus, Neptune) are massive, lower-density bodies composed mainly of light gases with extensive ring and moon systems, whereas terrestrial planets are dense, compact, and rocky.
Contrasting the two planetary categories isolates the unique physical traits of terrestrial planets.

Key Concept

Physical and compositional differences between terrestrial planets and gas giants

Alternative Method

Recall the two main planetary groups: inner rocky planets (dense, solid, few moons) versus outer gas giants (large, gaseous, low density, many moons).
Estimated Time:45s
Rate this question

Topics

The Solar System and Planets

More questions from this topic