oceanic crust [‚ō·shē′an·ik ′krəst] (geology) A thick mass of igneous rock which lies under the ocean floor. McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc. ...
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Samples of tholeiites from oceanic rifts, with the most primitive compositions of quenched glasses and liquidus minerals, were discovered within the three main test areas (the Hais, Petrov and 15°20′ fault zones). The use of mathematical modelling made it possible to estimate the compositions ...
Oceanic crust is the outermost solid layer of the Earth beneath the ocean basins. It is part of Earth's lithosphere and … The Highest Point on Earth Mount Everest vs. Mount Chimborazo vs. Mauna Kea: Earth’s Highest Points When we think of the highest point on Earth, Mount … ...
Earth has seven continents, but one ocean. The sea is not a simple thing: it hides mountain ranges with more volcanoes than all those on land, and it is stirred by a system of currents and complex tides.In plate tectonics, the oceanic plates of the lithosphere mix the cold crust with ...
Arctic Ocean to near the Southern Ocean. Part of the longest mountain range on Earth, this ridge is a site ofactive seafloor spreading, where tectonic plates pull apart, allowing magma to rise from the mantle. As the magma cools, it forms new oceanic crust, gradually widening the Atlantic ...
1.the act of a whale in breaking clear of the water 2.the breaking of sea waves on a shore or rock 3.an obsolete word forwound Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005 data breach An unauthorized dissemination of information. It may be due to an attack...
Cretaceous volcanic sequences and Jurassic oceanic crust in the East Mariana and Pigafetta basins of the western Pacific We report the results of the first regional multichannel seismic studies of both the East Mariana and Pigafetta basins of the western Pacific which imaged ... LJ Abrams 被引量...
It is now also generally accepted that a new ocean crust has been forming more or less continuously for at least the past 200 million years through a process of volcanic activity along the midocean ridge system (see seafloor spreading), which consists of a series of underwater mountains. On ...
Oceanic crust (the thin crust under the oceans) is thinner and denser than continental crust. Crust is constantly being created and destroyed; oceanic crust is more active than continental crust. Under the crust is the rocky mantle, which is composed of silicon, oxygen, magnesium, iron, ...