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MULTIPLE CHOICE QUESTION What causes the productivity (Net Primary Productivity) of areas on Earth to shift from the Northern to the Southern Hemisphere....and back, year after year after year? ◻ Water distribution through the desert and arid REGIONS. ◻ The Earth's axis tilt, position from the Sun and the resulting SEASONS. Sunspot activity.

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The Earth's axis tilt position from the Sun and the resulting SEASONS.

Explanation

The productivity, or Net Primary Productivity (NPP), of areas on Earth shifts between the Northern and Southern Hemispheres due to the tilt of the Earth's axis. The Earth's axis is tilted at an angle of about 23.5 degrees from the vertical. This tilt, combined with Earth's orbit around the sun, results in varying angles of sunlight reaching different parts of the Earth at different times of the year. When the Northern Hemisphere is tilted towards the sun, it experiences summer, with increased sunlight and higher productivity. Conversely, when the Southern Hemisphere is tilted towards the sun, it experiences summer, and the Northern Hemisphere experiences winter, with decreased sunlight and lower productivity. This cycle repeats annually, causing the shift in productivity between the hemispheres. Water distribution through desert and arid regions and sunspot activity do not have a significant impact on the annual shift of productivity between the hemispheres.

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