Many of the world's petroleum is trapped between 500 and 25,000 feet (152 and 7,620 meters) under dirt and rock. Other huge production facilities sit atop undersea towers that descend as far as 4,000 toes (1,219 meters) into the depths - taller than the world's most formidable skyscrapers. How do you drill in lightless ocean depths and transport all that liquid, أسعار الذهب اليوم gas and stable petroleum back to the floor? Since oceans cover practically three-quarters of Earth's floor, a subs...
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