The magma forming stratovolcanoes rises when water trapped both in hydrated minerals and in the porous basalt rock of the upper oceanic crust is released into crust, incorporating silica-rich crustal rock, leading to a final intermediate composition.
32.
Some 3.5 million to 4 million years ago, masses of hard, heavy, garnet-rich crustal rock called eclogite-- which had formed some 80 million years earlier-- broke away from the crust and began to sink into the mantle.
33.
Some 3 . 5 million to 4 million years ago, masses of hard, heavy, garnet-rich crustal rock called eclogite-- which had formed some 80 million years earlier-- broke away from the crust and began to sink into the mantle.
34.
Approximating it at as roughly 5 reservoirs : land-based biosphere, atmosphere, oceans, crustal rocks and fossil fuels; I have been trying to get some citable numbers for the annual pairwise exchanges of carbon between each of these in the modern era.
35.
A hot, thin plate is a weak plate, one that cannot support the weight of all the mountains on top of it : As a result it bends downward, and in so doing it displaces heavy mantle rock with light crustal rock.
36.
This huge gouge in the crustal rock-- caused as the newer Pacific plate spreads across the ocean floor and grinds up against the older and tougher continental plate-- runs the length of California's coast, turning inland to pass 25 miles northeast of Los Angeles.
37.
As part of this work, he introduced normal heights, which can be calculated from geopotential numbers ( obtained from precise levelling ) without needing the uncertain value of gravity along the plumbline of a point, i . e ., inside the continental crustal rock under the point.
38.
The pre-4.50 b . y . high upper-mantle rocks, the dominant rocks now preserved beneath Archean cratons, are not of partially-fractionated mantle as predicted by conventional interpretations, but instead are extremely refractory differentiates, depleted of most silicate materials that could have contributed partial melts of either continental or oceanic crustal rocks.
39.
It is thought that the total amount of iridium in the planet Earth is much higher than that observed in crustal rocks, but as with other platinum-group metals, the high density and tendency of iridium to bond with iron caused most iridium to descend below the crust when the planet was young and still molten.
40.
The oldest continental crustal rocks on Earth have ages in the range from about 3.7 to 4.28 billion years and have been found in the Narryer Gneiss Terrane in Western Australia, in the Acasta Gneiss in the Northwest Territories on the Canadian Shield, and on other cratonic regions such as those on the Fennoscandian Shield.
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