Download Marine Geology: Exploring the New Frontiers of the Ocean by Jon Erickson PDF

By Jon Erickson

ISBN-10: 0816048746

ISBN-13: 9780816048748

This absolutely revised and extended version of Marine Geology heavily examines the interrelationship among water and its lifestyles varieties and geologic constructions. It seems to be at a number of rules for the beginning of the Earth, continents and oceans, and the way those approaches healthy into the starting place of the universe. From monstrous submarine canyons to ocean volcanoes, this quantity covers the full realm of undersea landscapes and existence types.

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Additional resources for Marine Geology: Exploring the New Frontiers of the Ocean

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Geologists used the similarity of fossils in South America 35 Marine Geology Figure 25 The Red Sea and the Gulf of Aden are prototype seas created by seafloor spreading. The idea was that the continents were always fixed and that land bridges rose from the ocean floor to enable species to migrate from one continent to another. Later, the land bridges sank beneath the surface of the sea. However, a search for evidence of land bridges by sampling the ocean floor failed to turn up even a trace of sunken land.

Sonar depth ranging was another important tool for mapping undersea terrain. SeaMarc, a side-looking sonar system towed in a “fish” about 1,000 feet above the ocean floor, provided a sonar image of the ocean bottom (Fig. 34) by bouncing sound waves off the seabed. As ships traversed the Atlantic Ocean, onboard sonographs painted a remarkable picture of the ocean floor. 5 miles deep in the middle of the Atlantic Ocean was a huge submarine mountain range, surpassing in scale the Alps and the Himalayas com41 Marine Geology Figure 31 A piston corer on the ocean floor.

In contrast, today two-thirds of the continental landmass is located north of the equator. South of the equator, the breakdown is 10 percent landmass and 90 percent ocean. A single great ocean stretched uninterrupted across the planet, while the continents huddled to one side of the globe. The sea level fell substantially after the formation of Pangaea, draining the interiors of the continents and causing the inland seas to retreat. A continuous shallow-water margin ran around the entire perimeter of Pangaea.

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Marine Geology: Exploring the New Frontiers of the Ocean by Jon Erickson


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