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The polar circles encompass approximately 10% of the Earth's surface each. The Arctic Circle is around 4% while the Antarctic Circle covers a slightly larger area due to the continent of Antarctica.
The polar circle is a line on the surface of a sphere. Such a line can cover no area and so the answer to the question is 0%.
Water on or near Earth's surface includes oceans, lakes, rivers, groundwater, glaciers, and polar ice caps. Approximately 97% of Earth's water is in the oceans, about 2% is stored in glaciers and ice caps, and less than 1% is in lakes, rivers, and groundwater.
The climate zone below the Antarctic Circle is polar, characterized by extremely cold temperatures, high winds, and little precipitation. This region experiences long periods of darkness in winter and continuous daylight in summer.
Sunlight hits Earth's surface closer to the poles at a low angle, resulting in the energy being more spread out. This causes less intense sunlight and lower temperatures in polar regions compared to equatorial regions where sunlight hits more directly. The angle of sunlight hitting Earth's surface also contributes to the longer periods of darkness experienced in polar regions during their respective winter seasons.
Above the arctic circle.
Yes, about 71% of the Earth's surface is covered by water, mostly in the form of oceans. Water also makes up about 60% of the human body and is essential for life on Earth.