Connect Earth's Tilt with Seasons

Explain seasonal changes in daylight and Sun angle.

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Earth's axis is tilted relative to its orbit. During part of the year one hemisphere tilts toward the Sun, receiving longer daylight and more direct sunlight. The other hemisphere experiences the opposite seasonal tendency.

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When the Northern Hemisphere tilts toward the Sun, its summer occurs while the Southern Hemisphere has winter. This contrast cannot be explained by Earth-Sun distance alone.

1. What mainly causes Earth's seasons? The Moon covering the Sun every winter Axial tilt as Earth orbits the Sun Earth becoming hotter inside each July

2. When the Northern Hemisphere has summer, which season does the Southern Hemisphere have? Winter Summer everywhere No seasons

3. Which combination generally supports summer warming in a hemisphere? Shorter daylight and lower Sun angles Earth's rotation stopping Longer daylight and more direct sunlight

4. Why is distance from the Sun not a sufficient explanation for opposite seasons? Only one hemisphere orbits the Sun Both hemispheres share nearly the same Earth-Sun distance Sunlight never reaches the south

5. Does a seasonal explanation predict the exact weather on one afternoon? No, daily weather also varies Yes, every summer day is identical Yes, winter prevents every warm afternoon

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