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Hace 23 horas · In materials science, metallurgy, and engineering, a refractory metal is a metal or alloy that is extraordinarily resistant to heat and wear. Which metals belong to this category varies; the most common definition includes niobium, molybdenum, tantalum, tungsten, and rhenium. ... A sample of diaspore, an aluminum oxide hydroxide mineral, α-AlO(OH)
Hace 23 horas · Tibet is the highest region on Earth, with an average elevation of 4,380 m (14,000 ft). [1] [2] Located in the Himalayas, the highest elevation in Tibet is Mount Everest, Earth's highest mountain, rising 8,848.86 m (29,032 ft) above sea level. [3] The Tibetan Empire emerged in the 7th century.
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