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What is special about the sand in White Sands National Monument in New Mexico?

Answer:

The sand at White Sands is made up of gypsum instead of the quartz that you find in most sand. This makes it softer (You can scratch gypsum with your fingernail) and lighter. It also does not feel as hot, because it has a lower specific heat. That means that it takes less heat energy to make it hot, but it also has less heat energy to give up to cool off.
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