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White Sands is the largest gypsum dunefield on Earth

The dunes of White Sands in New Mexico cover 275 square miles, the largest gypsum dunefield in the world.

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They shift and settle over the Chihuahuan Desert. White Sands National Park preserves more than half of the dunefield.

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The Sargasso Sea has no coastline

The Sargasso Sea, which lies entirely within the Atlantic Ocean, is the only sea without a land boundary.

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The deepest point in the ocean is nearly 11 km down

Challenger Deep, in the Mariana Trench, is about 10,935 meters (35,876 feet) deep.

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Two ice sheets hold most of Earth's fresh water

The Antarctic and Greenland ice sheets together contain more than 99 percent of the land ice and over 68 percent of the fresh water on Earth.

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