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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