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Abyssal plains are so flat because of the collection of clay and silt. These fine grained sediments will deposit in all crevices until the surface is completely smooth.

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9y ago
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13y ago

The abyssal plain lies under a layer of sediment 500 to 1000m (about 1600 to 3300 ft) thick. The sediment has made the abyssal plain the flattest place on Earth.

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Q: Why is the abyssal plain so flat?
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