Handout4

Handout4 - ; continental slope has the steepest slope, and...

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HANDOUT FOR CHAPTER 4 Continental Margins and Ocean Basins * The earth is about 4.6 billion years old. * Surface of the Earth: 70.8% by ocean, 29.2% by land. * More than 97% of all the water found at or near the surface of the Earth is contained in the ocean while the bulk of the remaining ~3% is contained in the glaciers in Antarctic Continent and Greenland. * Among the three major oceans (Pacific, Atlantic, and Indian), the largest and oldest is Pacific, while the smallest and youngest is Indian. * The average elevation of land is 840 m, and the average depth of ocean is 3,790 m. * The tallest mountain, Mt. Everest is 8,848 m, while the deepest known depth, Mariana Trench is 11,035 m. * Continental margin (Continental shelf , continental slope , continental rise) , and deep-sea floor (abyssal plain, abyssal hills, seamounts, guyots, oceanic ridges, oceanic plateaus)
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Unformatted text preview: ; continental slope has the steepest slope, and the abyssal plain is the flattest. * Submarine canyons are V-shaped indentation incised into the continental shelf and slope, of-ten terminating on the deep-sea floor in a great fan of sediment. * Turbidity currents are an underwater avalanche of sediments thought responsible for the sculpturing of submarine canyons and a means of sediment transport into abyssal plains. * Abyssal plains and abyssal hills . * Seamounts and guyots . * A hypsographic curve is a plot of the area of the Earth's surface above any given elevation or depth above or below sea level * During the last glacial period (15,000 - 18,000 years ago), sea level was ~ 130 - 140 m lower than the present level, and the coast was located near the shelf break (i. e., River mouths were located near the shelf break)....
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