What phenomenon occurs at the poles during the solstices?

• A. 24 hours of daylight
• B. 24 hours of nightlight
• C. 12 hours of daylight and nightlight
• D. Variable daylight hours

Answer: (D)

During the solstices, the poles experience extreme variations in daylight hours due to the tilt of the Earth's axis. At the Arctic and Antarctic Circles, this tilt causes one pole to remain in continuous daylight while the opposite pole is shrouded in darkness.

For instance, during the summer solstice, the North Pole has 24 hours of daylight, while at the South Pole, it experiences 24 hours of night. Conversely, during the winter solstice, the situation is reversed: the North Pole is in darkness for 24 hours while the South Pole enjoys continuous daylight.

The correct answer, which indicates "variable daylight hours," reflects how, depending on the time of year and the specific pole in question, the hours of daylight can vary significantly. This option acknowledges that while one pole may experience constant daylight, the other will be enveloped in darkness, leading to a dynamic range of light exposure at the poles throughout the year.