Multiple Choice
Why is the equator generally warmer than the poles?
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20. Heat and Temperature
Temperature
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Why is it generally warmer near the equator than near the poles?
A
The equator receives more direct sunlight throughout the year.
B
The equator has more volcanic activity, which increases temperatures.
C
The equator has a thicker atmosphere that traps more heat.
D
The equator is closer to the sun than the poles.
Verified step by step guidance1
Understand the concept of solar radiation: The Earth receives energy from the Sun in the form of solar radiation. This energy is distributed unevenly across the planet due to the curvature of the Earth.
Consider the angle of sunlight: Near the equator, sunlight strikes the Earth more directly, meaning the angle of incidence is closer to perpendicular. This direct sunlight is concentrated over a smaller area, leading to higher temperatures.
Contrast with the poles: At the poles, sunlight arrives at a much shallower angle, spreading the energy over a larger area. This results in less intense solar heating and cooler temperatures.
Evaluate atmospheric effects: While the atmosphere does play a role in trapping heat, the thickness of the atmosphere is relatively uniform across the globe. The key factor is the angle of sunlight, not atmospheric thickness.
Clarify misconceptions: The equator is not significantly closer to the Sun than the poles. The difference in distance due to Earth's shape is negligible compared to the effect of sunlight angle.
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