| 单词 | lower mantle |
| 例句 | Therefore the materials in the upper and lower mantle must at least occasionally mix. A Short History of Nearly Everything 2003-05-06T00:00:00Z The model suggests that material was denser than the upper mantle of proto-Earth and sank into the lower mantle, where it has remained as identifiable blobs, never mixing. 4.5 billion years ago, another planet crashed into Earth. We may have found its leftovers. 2023-11-01T04:00:00Z The researchers' simulations showed that much of the energy delivered by Theia's impact remained in the upper half of the mantle, leaving Earth's lower mantle cooler than estimated by earlier, lower-resolution impact models. The remains of an ancient planet lie deep within Earth 2023-11-01T04:00:00Z But it’s really a pocket of the mineral ringwoodite from 660 kilometers down, at the boundary between the upper and lower mantle. Oceans’ Worth of Water Hidden Deep in Earth, Ultra Rare Diamond Suggests 2022-09-26T04:00:00Z The lower mantle has a similar chemical composition, but because of the extreme pressures, different minerals are present, including spinels and garnets. Physical Geology 2015-01-01T00:00:00Z Detection of mantle plumes in the lower mantle by diffraction tomography: Hawaii. An Introduction to Geology 2017-01-01T00:00:00Z The minerals morph and change as they leave the high pressure and scorching temperatures of the lower mantle, however. New Mineral Discovered in Deep-Earth Diamond 2021-11-11T05:00:00Z “That lower mantle does not exist on Mars,” Khan says. InSight Lander Makes Best-Yet Maps of Martian Depths 2021-07-22T04:00:00Z The subducting slabs first interacted with the lower mantle 10 million to 30 million years after subduction initiation. Lost tectonic history recovered from Earth’s deep mantle 2019-01-22T05:00:00Z The convection of the mantle is a product of the transfer of heat from the core to the lower mantle. Physical Geology 2015-01-01T00:00:00Z The mesosphere, sometimes known as the lower mantle, is more rigid and immobile than the asthenosphere. An Introduction to Geology 2017-01-01T00:00:00Z Inferring from mineral concentrations closer to the earth’s surface, geoscientists suspect that davemaoite makes up about 5 to 7 percent of the lower mantle. New Mineral Discovered in Deep-Earth Diamond 2021-11-11T05:00:00Z The boron, encompassed by rock that protects the mineral from the mantle’s high pressure and heat, continues on its path hundreds of miles downward until it reaches the lower mantle. How Rare Blue Diamonds Form Deep below the Ocean Floor 2018-08-01T04:00:00Z Upside-down differentiation and generation of a ‘primordial’ lower mantle. Hadean silicate differentiation preserved by anomalous 142Nd/144Nd ratios in the Réunion hotspot source 2018-02-27T05:00:00Z Reconciling dynamic and seismic models of Earth’s lower mantle: the dominant role of thermal heterogeneity. Tidal tomography constrains Earth’s deep-mantle buoyancy 2017-11-14T05:00:00Z The picture gets cloudier in the lower mantle, where the ULVZs live. A molten puddle deep under Iceland may reveal where volcanoes get their lava 2017-07-27T04:00:00Z Such variations may also reveal more about the connections between the earth’s crust and its lower mantle, perhaps helping to explain how elements travel between them. New Mineral Discovered in Deep-Earth Diamond 2021-11-11T05:00:00Z Shearing experiments at lower mantle conditions show that the less abundant of the two major mantle minerals is easily deformed. Shear deformation of bridgmanite and magnesiowüstite aggregates at lower mantle conditions | Science 2016-01-07T05:00:00Z The reason this mineral is so difficult to study is because it is found deep underground in the Earth’s lower mantle, exposed to high temperatures and pressure, beyond the reach even of modern scientists. Bridgmanite: A New Name For the Earth’s Most Abundant Mineral Goncharov says that means magmas at high pressures in the lower mantle must be sponging up heat emanating from the core. 'Dark magma' could explain mystery volcanoes 2014-11-11T05:00:00Z Romanowicz says the debate will get resolved as pictures of the lower mantle improve. A molten puddle deep under Iceland may reveal where volcanoes get their lava 2017-07-27T04:00:00Z “Having the real minerals from the lower mantle still present is a fairly new direction for this type of research,” he adds. New Mineral Discovered in Deep-Earth Diamond 2021-11-11T05:00:00Z Shearing experiments at lower mantle conditions show that the less abundant of the two major mantle minerals is easily deformed. Shear deformation of bridgmanite and magnesiowüstite aggregates at lower mantle conditions | Science 2016-01-07T05:00:00Z The lower mantle is composed of more dense minerals, which are stable over a wide range of thermodynamic conditions. Earth science: Crystallography's journey to the deep Earth 2014-02-26T18:21:20.042Z The boundary between Earth's core and mantle defines where the iron-rich liquid outer core meets the more chemically heterogeneous solid lower mantle and is marked by a sharp thermal gradient of nearly 1500 kelvin. [Report] Low Core-Mantle Boundary Temperature Inferred from the Solidus of Pyrolite 2014-01-30T19:26:05.902Z This lower mantle forms the majority of the earth by volume, yet is poorly understood. Some facets of the geology of diamonds 2013-05-09T13:15:00.553Z Magnesium silicate perovskite is the major component of Earth’s lower mantle — the layer of molten rock between the crust and the core, which accounts for half the planet’s mass. The Mysterious Case of the Missing Noble Gas 2012-10-11T17:15:01.623Z Nearby, seismometers are listening posts for earthquake reverberations bearing clues to the structure of Earth’s inner core and lower mantle. Amazing Race to the Bottom of the World 2011-12-12T23:39:04Z The researchers suggest these diamonds crystallized when diamond-forming fluids that originated in basalt from ocean crust subducted into the lower mantle. 'Superdeep' Diamonds Hint at Depth of Carbon Cycle 2011-09-16T17:45:05.187Z Under these extreme conditions — similar to those in the lower mantle — the mineral sopped up argon yet found little room for xenon. The Mysterious Case of the Missing Noble Gas 2012-10-11T17:15:01.623Z |
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