| Some ore deposits occur in alkalic ultrabasic rocks derived from the Earth's mantle. |
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| A continuing gradual dehydration of the Earth's mantle may by then have begun to drown the ridges and to flood the surface of the planet. |
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| These conditions range from extremely high temperature and pressure in Earth's mantle to supergene transformations on Earth's surface. |
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| These include silicon dioxide, or silica, the most abundant mineral in Earth's mantle and crust. |
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| Its lavas are notable for containing many mantle xenoliths, pieces of the Earth's mantle brought to the surface by volcanic eruptions. |
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| Contoured pahoehoe lava crusted over as new earth within a day of billowing from the Earth's mantle. |
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| In the Kalmiopsis Wilderness section of the Rogue basin are some of the world's best examples of rocks that form the Earth's mantle. |
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| The Moon's mean density is 3.34 grams per cubic cm, close to that of Earth's mantle. |
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| Lehmann is also known for researching Earth's mantle. |
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| The decay of the radionuclides in rocks of the Earth's mantle and crust contribute significantly to Earth's internal heat budget. |
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| Continents sit on continental lithosphere which is part of tectonic plates floating high on Earth's mantle. |
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| Recent studies suggest that deep processes rooted in the Earth's mantle may have contributed to the uplift of the High and Middle Atlas. |
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| Seamounts are made by extrusion of lavas piped upward in stages from sources within the Earth's mantle to vents on the seafloor. |
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| However, much of the field may have been screened out by the Earth's mantle. |
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| No modern komatiite lavas are known, as the Earth's mantle has cooled too much to produce highly magnesian magmas. |
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| Consider the hot rocks of the Earth's mantle. |
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| New magma of basalt composition emerges at and near the axis because of decompression melting in the underlying Earth's mantle. |
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| Molten rock is emerging from the Earth's mantle at the Mid-Atlantic Ridge, providing new seabed, and as it solidifies, records the magnetic field. |
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| Freed from the weight of ice that thrust it down into the Earth's mantle during the last ice age, Scandinavia is now rising up again. It rises by between 40 and 120 cm per century. |
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| The barrens are well represented by the Tablelands in the southern section of the park. This area is underlain by ultramafic bedrock originating in the Earth's mantle many kilometres below the surface. |
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| Peridotite at depth in the Earth's mantle may be hotter than its solidus temperature at some shallower level. |
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| Current research indicates that complex convection within the Earth's mantle allows material to rise to the base of the lithosphere beneath each divergent plate boundary. |
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| The team has analyzed the ratios of noble gas isotopes from deep within Earth's mantle, and has compared these results to isotope ratios closer to the surface. |
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| The new results are significant in that they show that the Riihivaara Kimberlite sampled a portion of the Earth's mantle that has a high potential to be diamondiferous. |
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| Various explanations were proposed for volcano behavior before the modern understanding of the Earth's mantle structure as a semisolid material was developed. |
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| Specifically, they got the idea to drill through the ocean floor to the Moho discontinuity and to extract a piece of the Earth's mantle for examination at leisure. |
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| As you pull the lithosphere apart, as it separates, decompression occurs in the earth's mantle underneath the spreading centre. |
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| Ocean ridges are linear features on the ocean floor where molten magma originating in the earth's mantle rises and solidifies to form new ocean crust. |
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