Portal:Earth sciences/DYK/2

...that a tuya (pictured) is a type of flat-topped, steep-sided volcano formed when lava erupts through a thick glacier or ice sheet?
...that in the United States, on average tornadoes are around 500 feet (150 m) across, and stay on the ground for 5 miles (8 km)?
...that dust storms can carry large amounts of dust, so much so that the leading edge of one can appear as a solid wall of dust as much as 1.6 km (1 mile) high?
...that the area of the world Ocean is 361 million square kilometers, its volume is approximately 1.3 billion cubic kilometers, and its average depth is 3,790 meters?
...that three quarters of the earth's atmosphere lies within the troposphere, and the depth of this layer varies between 17 km at the equator and 7 km at the poles?
...that the Mariana Trench is the deepest point in the ocean?

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