Without the greenhouse effect, the average global temperature would be _____.

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Prepare for your Introduction to Physical Geology Exam. Tackle diverse topics with multiple-choice questions and detailed explanations. Equip yourself with knowledge about Earth's physical processes and surface features. Ace your exam with confidence!

Multiple Choice

Without the greenhouse effect, the average global temperature would be _____.

Explanation:
The idea being tested is how the greenhouse effect affects Earth's average surface temperature. Greenhouse gases trap infrared heat that would otherwise escape to space, acting like a blanket that keeps the surface warmer. If those gases were removed, the planet would lose that additional warming, so the average temperature would drop by a large amount. The widely cited scientific estimate for the average surface temperature without any greenhouse warming is about -18°C, which is far below freezing. Some classroom-style figures round or simplify this to around 0°C to emphasize the cooling, but the real change is substantial—a drop of tens of degrees. The key point is that removing the greenhouse effect cools the planet significantly, not just a little.

The idea being tested is how the greenhouse effect affects Earth's average surface temperature. Greenhouse gases trap infrared heat that would otherwise escape to space, acting like a blanket that keeps the surface warmer. If those gases were removed, the planet would lose that additional warming, so the average temperature would drop by a large amount. The widely cited scientific estimate for the average surface temperature without any greenhouse warming is about -18°C, which is far below freezing. Some classroom-style figures round or simplify this to around 0°C to emphasize the cooling, but the real change is substantial—a drop of tens of degrees. The key point is that removing the greenhouse effect cools the planet significantly, not just a little.

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