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the antarctic ice sheets are in constant motion. antarctica can be thought of as a continent covered by a single enormous glacier. about half of the arctic sea-ice volume has disappeared since 1979. the arctic is a large landmass surrounded by a cold ocean. the antarctic is generally colder than the arctic.

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The correct response is that Antarctic Sea ice has increased, then declined over the past fifty years, while Arctic sea ice has decreased.

Explanation:

The quantity of solar energy received by sea ice's surface increases as it melts near the surface, causing ice melt to occur more quickly. Sea ice also contributes to keeping the air cool by forming a barrier between the warmer water below and the cooler air above. The Antarctic sea ice is essential to the environment of penguins and other animals. Globally, there is less sea ice due to increasing air and ocean temperatures. There will be more intense heatwaves worldwide because there will be less ice to reflect heat. However, warmer air has the potential to induce the polar jet stream, a high-pressure wind that circles the Arctic region, to drop south, bringing bitter cold with it. This can result in harsher winters.

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