Article: Airguns gauge undersea volcanoes.(Geology)
USA Today (Magazine);  June 1, 2005 ;     488 words ......which tectonic plates separate along midocean ridges controls processes such as heat transfer...40-kilometer-deep crust on the seafloor. Midocean ridges produce most of the volcanism on the...in various processes occurring at midocean ridges. However, geologists have not had...

Article: Chattian
A Dictionary of Zoology;      25 words ...Chattian The final stage of the Oligocene Epoch, from about 28.4 to 23.03 Ma ago. It is dated by means of seafloor spreading rates, small mammals, and plankton .

Article: HOT NEWS FROM THE DEEP SEA.(Brief Article)
Rocks & Minerals;  May 1, 2000 ;     700+ words ......occupying one-third of the ocean floor, midocean ridges form one of the largest physiographic...ILLUSTRATION OMITTED] Volcanic activity at midocean ridges generates new ocean crust that leads...sea-floor spreading. Recent research at midocean ridges has provided important evidence ...

Article: seafloor spreading
World Encyclopedia;      43 words ...seafloor spreading Theory that explains how continental drift occurs. It proposes that the ocean floor is moved laterally as new basalt rock is injected along mid-ocean ridges, and so the ocean floor becomes older with increasing distance from the ridge. See also plate tectonics

Article: Vine, Fred J. (1939- )
World of Earth Science;      480 words ......did crucial work on the process of seafloor spreading. The German scientist Alfred Wegener...x2013; 1969) hypothesized that seafloor spreading was responsible for the motion of...would provide strong support for the seafloor spreading theory. It had long been suspected...

Article: plate tectonics
The Columbia Encyclopedia, Sixth Edition;      700+ words ......of continental drift and seafloor spreading into a coherent model and...will form by the process of seafloor spreading. Mid-ocean ridges, undersea...chains, are the locus of seafloor spreading and are the sites where...

Article: Matthews, Drummond (1931-1937)
World of Earth Science;      651 words ......sixties Harry Hess (1906 – 1969) hypothesized that seafloor spreading was responsible for the motion of the continents. In 1963...that, if confirmed, would provide strong support for the seafloor spreading hypothesis. It had long been suspected, but not proven...

Article: Oceanography: Seafloor Spreading
American Decades;      681 words ...OCEANOGRAPHY: SEAFLOOR SPREADING Liquid Layer In 1960 the theory of plate tectonics was...mantle. The core samples from Cuss I gave indirect proof of seafloor spreading by the mantle pushing up in the ocean rifts. The closer...

Article: Weddell sea tectonics and Gondwana break-up.
Arctic;  March 1, 1997 ;     700+ words ......volume is to answer questions relating to the history of seafloor spreading in the Weddell Sea and a number of related questions...the United States. The reader should keep in mind that seafloor spreading is a term related to plate tectonics and continental drift...

Article: hydrothermal vent
The Columbia Encyclopedia, Sixth Edition;      238 words ......floor that spews out water heated to high temperatures by the magma under the earth's crust. Some vents are in areas of seafloor spreading , and in some locations water temperatures above 350°C (660°F) have been recorded. The vents' hot springs leach out...

Article: Hess, Harry Hammond (1906-1969)
World of Earth Science;      700+ words ......most important contributions to science was the concept of seafloor spreading, which became a cornerstone in the acceptance of the continental...the war ended, Hess continued to study guyots as well as midocean ridges, which run down the centers of the Atlantic and Pacific...

Article: Biological activity found 1,000 feet below surface. (Oceanography).
USA Today (Magazine);  June 1, 2003 ;     462 words ......Oregon State University, Corvallis, and several other institutions conducted the research off the coast of Oregon near a seafloor spreading center on the Juan de Fuca Ridge. In 3,500,000-year-old crust almost 1,000 feet beneath the bottom of the ocean, they...

Article: Marie Tharp
The Columbia Encyclopedia, Sixth Edition;      124 words ......Heezen's group confirmed that seismic activity along the ridge was centered on the rift, it provided solid evidence of seafloor spreading and plate tectonics . Tharp and Heezen's work mapping the oceans ultimately led to the discovery of a 40,000 mi (64,000...

Article: volcano
The Columbia Encyclopedia, Sixth Edition;      700+ words ......is a good polishing and cleansing agent. Occurrence Volcanoes are found in association with midocean ridge systems (see seafloor spreading ) and along convergent plate boundaries, such as around the Pacific Ocean's Ring of Fire (see plate tectonics ), the ring...