[PPT]Volcanoes and Igneous Activity Earth - Chapter 4 · Web viewPrentice Hall EARTH SCIENCE...
Transcript of [PPT]Volcanoes and Igneous Activity Earth - Chapter 4 · Web viewPrentice Hall EARTH SCIENCE...
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Prentice Hall EARTH SCIENCEEARTH SCIENCE
Tarbuck Lutgens
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Chapter
1414 The Ocean Floor
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The Blue Planet
14.1 The Vast World Ocean
Nearly 71 percent of Earth’s surface is covered by the global ocean.
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Geography of the Oceans
14.1 The Vast World Ocean
The world ocean can be divided into four main ocean basins—the Pacific Ocean, the Atlantic Ocean, the Indian Ocean, and the Arctic Ocean.
• The Arctic Ocean is about 7 percent of the size of the Pacific.
• The Pacific Ocean is the largest and has the greatest depth.
• The Atlantic Ocean is about half the size of the Pacific and not quite as deep.
• The Indian Ocean, largely a southern hemisphere body, is slightly smaller than the Atlantic.
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Mapping the Ocean Floor
14.1 The Vast World Ocean
The topography of the ocean floor is as diverse as that of the continents.
Today’s technology—particularly sonar, satellites, and submersibles—allows scientists to study the ocean floor in a more efficient and precise manner than ever before.
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The Topography of the Ocean
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Mapping the Ocean Floor
14.1 The Vast World Ocean
Sonar• Sonar is an acronym for sound navigation and
ranging. It is also referred to as echo sounding.• Sonar works by transmitting sound waves
toward the ocean bottom.
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Sonar Methods
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Mapping the Ocean Floor
14.1 The Vast World Ocean
Satellites• Satellites are able to measure small differences
by bouncing microwaves off the ocean surface.• Using this new technology, scientists have
discovered that the ocean surface is not perfectly flat.
• Differences in the height of the ocean surface are caused by ocean-floor features.
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Satellite Methods
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Mapping the Ocean Floor
14.1 The Vast World Ocean
Submersibles• Submersibles are small underwater crafts used
for deep-sea research.• Today, many submersibles are unmanned and
operated remotely by computers. These remotely operated vehicles (ROVs) can remain underwater for long periods.
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Mapping the Ocean Floor
14.2 Ocean Floor Features
The ocean floor regions are the continental margins, the ocean basin floor, and the mid-ocean ridge.
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Continental Margins
14.2 Ocean Floor Features
In the Atlantic Ocean, thick layers of undisturbed sediment cover the continental margin. This region has very little volcanic or earthquake activity.
In the Pacific Ocean, oceanic crust plunges beneath continental crust. This force results in a narrow continental margin that experiences both volcanic activity and earthquakes.
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Continental Margins
14.2 Ocean Floor Features
Continental Shelf• Continental shelves contain important mineral
deposits, large reservoirs of oil and natural gas, and huge sand and gravel deposits.
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Energy Resources
14.4 Resources from the Seafloor
Oil and natural gas are the main energy products currently being obtained from the ocean floor.
• Gas hydrates are compact chemical structures made of water and natural gas.
Gas Hydrates
• Most oceanic gas hydrates are created when bacteria break down organic matter in ocean-floor sediments.
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Gas Hydrates
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Other Resources
14.4 Resources from the Seafloor
Other major resources from the ocean floor include sand and gravel, evaporative salts, and manganese nodules.
Sand and Gravel• The offshore sand-and-gravel industry is second
in economic value only to the petroleum industry.
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Other Resources
14.4 Resources from the Seafloor
Manganese Nodules
Evaporative Salts• When seawater evaporates, the salt increases in
concentration until it can no longer remain dissolved. When the concentration becomes high enough, the salts precipitate out of solution and form salt deposits.
• Manganese nodules are hard lumps of manganese and other metals (like cobalt, copper, and iron) that precipitate around a small object.
• The most economically important salt is halite—common table salt.
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Manganese Nodules
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The Study of the Oceans Project Booklet
*Chapter 14 The Ocean Floor– Copy ALL KEYS in the Chapter and divide
them up in Sections.Example:14.1 The Vast World OceanNearly 71: of Earth’s……….The world ocean can be……….– Draw, Color, and Label p. 402 (Your paper)– WS Ocean Floor Features