Seasons - AP Environmental Science

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Question

The seasons experienced on Earth are caused by                     .

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Answer

Contrary to what many people think, the seasons are caused by the amount of light that the surface of each hemisphere of Earth receives during different parts the year. Because of the tilt of the Earth's axis and its rotation, certain months of the year result in more direct sunlight, but not necessarily because they are closer to the sun. The Northern hemisphere receives less sunlight during some months when the Earth's axis is tilted away from the sun; the resulting season is winter. Each ray of sunlight is spread out over more distance at the poles, whereas the warmest areas (at the equator) get the most direct sunlight. When Earth's axis is pointed towards the sun, the resulting season is summer in the Northern Hemisphere and winter in the Southern Hemisphere.

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