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Ecology: Abiotic environment and biomes · Global Climate Patterns

How sunlight, air circulation, oceans, mountains and altitude create the climates that shape where life thrives.

Ecology · 31 questions

Try 3 questions

1. Why is it generally hotter near the equator than near the poles?

  1. The equator has a thinner atmosphere
  2. The equator is closer to the Sun
  3. Sunlight strikes it more directly
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Answer: Sunlight strikes it more directly

Near the equator sunlight arrives nearly overhead, so the same beam of energy is concentrated on a smaller area of ground. Differences in distance to the Sun across Earth are negligible.

2. What is the main cause of Earth's seasons?

  1. The tilt of Earth's axis
  2. Changes in Earth's distance from the Sun
  3. Yearly changes in the Sun's output
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Answer: The tilt of Earth's axis

Earth's axis is tilted about 23.5 degrees, so each hemisphere alternately leans toward the Sun, getting more direct light and longer days.

3. Earth is closest to the Sun in early January, during Chile's summer and Canada's winter. What does this show?

  1. Distance from the Sun does not drive seasons
  2. The Northern Hemisphere receives more sunlight
  3. Distance mainly drives Southern Hemisphere seasons
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Answer: Distance from the Sun does not drive seasons

If distance caused seasons, both hemispheres would have summer in January. Opposite seasons at the same moment point to axial tilt as the cause.

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