The abyssal zone, or the abyss, is the seafloor and water column from 3,000 to 6,500 meters (9,842 to 21,325 feet) depth, where sunlight doesn’t penetrate.
The ocean water column is made up of five zones: the sunlight (epipelagic), twilight (mesopelagic), midnight (bathypelagic), abyssal (abyssopelagic) and hadal zones (trenches).
When you’re on a boat 50 miles south of Cape Cod on a calm day, the water around you may look flat and relatively featureless. A few hundred feet below, however, a cliff-edge hovers over an abyss. That edge, running roughly parallel to the coastline, is called the shelf break.…
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PPG soon became the United States' first commercially successful producer of high-quality, thick flat glass using the plate process. PPG was also the world's first plate glass plant to power its furnaces with locally produced natural gas, an innovation which rapidly stimulated widespread industrial use of the cleaner-burning fuel. [3]
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