Which of the following is true relating Earth and Venus?

Question

BlackTom AI · Accepted Answer

To evaluate the statements, let’s consider what we know about Earth and Venus and their atmospheres.
Option 1: 'The greenhouse effect warms both Earth and Venus, but Venus much more so.' This is accurate. Both planets experience greenhouse warming, but Venus has a dense CO2-rich atmosphere and thick clouds that trap far more infrared radiation, leading to extremely high surface temperatures. This statement correctly captures the comparative strength of the greenhouse effect on the two planets.
Option 2: 'Venus suffered a runaway greenhouse effect which caused its atmosphere to completely dissipate into space.' This is incorrect. Venus did not lose its atmosphere; in fact it retains a very thick atmosphere dominated by CO2. A runaway greenhouse effect on Venus contributed to its extreme surface temperatures, but it did not result in the atmosphere dissipating into space.
Option 3: 'Earth's greenhouse effect is stronger than on Venus, resulting in moderate temperatures.' This is misleading. Earth's greenhouse effect is real and contributes to a moderate, life-supporting climate, but it is far weaker than Venus’s, which is why Venus is much hotter despite being at a similar solar distance.
Option 4: 'Venus is much smaller than Earth so it lost its atmosphere due to its weak gravity.' This is factually incorrect. Venus is similar in size to Earth and has a strong enough gravity to retain a thick atmosphere; its current atmosphere is not due to atmospheric loss from weak gravity but to its atmospheric composition and runaway greenhouse conditions.

Which of the following is true relating Earth and Venus?Single choice

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