The ocean is heating up. That's the conclusion of a new study that finds that Earth's oceans now26heat at twice the rate they did 18 years ago. Around half of ocean heat intake since 1865 hastaken place since 1997, researchers report online in Nature Climate Change.Warming waters are known to27to coral bleaching (珊瑚白化) and they take up more spacethan cooler waters, raising sea28While the top of the ocean is well studied, its depths are moredifficult to29The researchers gathered 150 years of ocean temperature data in order to get abetter30 of heat absorption from surface to seabed. They gathered together temperature readingscollected by everything from a 19th century31 of British naval ships to modem automated oceanprobes. The extensive data sources,32 with computer simulations ( 计算机模拟), created atimeline of ocean temperature changes, including cooling from volcanic outbreaks and warming fromfossil fuel33About 35 percent of the heat taken in by the oceans during the industrial era now resides at a34 of more than 700 meters, the researchers found. They say they're35whether the deep-seawarming canceled out warming at the sea's surface.A. absorbB. CombinedC. ContributeD. depthE. emissionsF. excursionG. exploreH. floorI. heightsJ. indifferentK. levelsL. mixedM. pictureN. unsureO. voyage