Question

which correctly compares the planets venus and mercury? both are small but venus is hotter. both are hot planets, but only mercury is larger than earth. both are close to the sun but only mercury has an atmosphere. both are rocky planets; only venus spins in the same direction as earth.

Explanation:

1. Analyze Option A: Venus has a thick atmosphere causing a strong greenhouse effect, making it hotter than Mercury. Both are small (terrestrial, rocky planets). This statement is correct.
2. Analyze Option B: Mercury is smaller than Earth, and Venus is similar in size to Earth. So this is incorrect.
3. Analyze Option C: Venus has a very dense atmosphere, while Mercury has a very thin exosphere (not a significant atmosphere like Venus). So this is incorrect.
4. Analyze Option D: Both Venus (retrograde spin, opposite to Earth) and Mercury? No, Venus spins retrograde (opposite to Earth's spin direction), while Earth and Mercury spin in the same direction. Wait, correction: Venus has a retrograde rotation (spins opposite to most planets including Earth), Mercury spins in the same direction as Earth. So the statement "only Venus spins in the same direction as Earth" is wrong. But wait, re - checking: Venus rotates clockwise (retrograde) when viewed from above the Sun's north pole, Earth and Mercury rotate counter - clockwise. So the green option's statement is incorrect. Wait, maybe I made a mistake. Wait, the green option says "Both are rocky planets; only Venus spins in the same direction as Earth." But Venus spins retrograde, opposite to Earth. So that's wrong. Wait, but the red option: "Both are small but Venus is hotter." Mercury is the closest to the Sun, but Venus's thick atmosphere (CO₂) traps heat, making its surface temperature higher than Mercury's. Both Mercury and Venus are small (terrestrial planets, smaller than gas giants). So option A is correct. Wait, maybe the initial analysis of the green option was wrong. Let's re - check the rotation: Earth rotates counter - clockwise (prograde), Venus rotates clockwise (retrograde), Mercury rotates counter - clockwise (prograde). So "only Venus spins in the same direction as Earth" is wrong because Mercury also spins in the same direction as Earth, and Venus does not. So the correct option is the red one: "Both are small but Venus is hotter."

Answer:

A. Both are small but Venus is hotter.