The inner planets Mercury, Venus, Earth, and Mars differ from the outer planets Jupiter, Saturn, Uranus, and Neptune in that the inner planets are made largely of

Rationale

Rocky material.

The inner planets—Mercury, Venus, Earth, and Mars—are primarily composed of solid, rocky material, distinguishing them from the outer planets, which are largely gaseous. This fundamental difference in composition influences various characteristics, including density, surface features, and atmospheric conditions.

A (rocky material) CORRECT

The inner planets are formed from silicate rocks and metals, giving them a solid surface and a higher density compared to the gas giants. This composition allows for varied geological features, such as mountains, valleys, and craters, which are not found in the outer planets.

B (gaseous material) YOUR ANSWER

Gaseous material is a defining characteristic of the outer planets, not the inner ones. Jupiter, Saturn, Uranus, and Neptune are primarily composed of hydrogen and helium, lacking solid surfaces. The inner planets' rocky nature contrasts sharply with the gaseous composition of the outer planets.

C (hydrogen) YOUR ANSWER

Hydrogen is abundant in the outer planets, where it primarily exists in gaseous form. The inner planets contain very little hydrogen, as their solid, rocky composition does not support the same atmospheric conditions that lead to hydrogen accumulation.

D (water vapor) YOUR ANSWER

While water vapor may be present in the atmospheres of some inner planets, it is not a primary component of their structure. The primary composition of the inner planets is solid rock and metal, rather than water vapor, which is more characteristic of certain atmospheric conditions rather than planetary composition.

Conclusion

The inner planets differ from the outer planets by being predominantly composed of rocky material, which influences their density, surface conditions, and geological activity. In contrast, the outer planets are primarily gaseous, showcasing a clear distinction in planetary formation and characteristics. Understanding these differences is crucial for studying the solar system's structure and evolution.

The inner planets Mercury, Venus, Earth, and Mars differ from the outer planets Jupiter, Saturn, Uranus, and Neptune in that the inner planets are made largely of

Rocky material.

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