Read the passage.
Antarctica: Not What You Think

When people think of Antarctica, they think of snow and ice. When they think of deserts, they think of sun, heat, and sand. Yet in spite of its cold temperatures, Antarctica is actually a desert. In fact, it is the largest desert on the planet. A desert is a very dry environment that receives less than ten inches of precipitation yearly. On average, Antarctica gets less than two inches. Most of that precipitation is in the form of snow, but rain or ice can sometimes fall as well.
What is the main, or central, idea of the passage?
Even though Antarctica is cold and has snow, it is a desert.
Most precipitation in Antarctica is in the form of snow, though it can also get rain or ice.
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