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A mantle is a layer inside a planetary body bounded below by a core and above by a crust. Mantles are made of rock or ices, and are generally the largest and most massive layer of the planetary body. Mantles are characteristic of planetary bodies that have undergone differentiation by density.
Earth's mantle is a layer of silicate rock between the crust and the outer core. It has a mass of 4.01 × 10 24 kg (8.84 × 10 24 lb) and makes up 67% of the mass of Earth. [ 1 ] It has a thickness of 2,900 kilometers (1,800 mi) [ 1 ] making up about 46% of Earth's radius and 84% of Earth's volume.
8 Αυγ 2024 · Researchers extracted an almost uninterrupted 1,268-metre long sample of green-marble-like rock from a region where Earth’s mantle — the thick, interior layer that makes up more than 80% of...
30 Απρ 2024 · The rocks that make up Earth’s mantle are mostly silicates —a wide variety of compounds that share a silicon and oxygen structure. Common silicates found in the mantle include olivine, garnet, and pyroxene.
12 Αυγ 2024 · When seawater reacts with mantle rocks beneath the Earth’s surface, it can produce hydrogen and methane, which bubble back into the ocean through hydrothermal vents.
12 Ιουν 2023 · Scientists have drilled a hole thousands of feet beneath the floor of the North Atlantic Ocean and extracted rocks from Earth’s mantle. It’s the deepest hole ever dug to collect mantle rock ...
From a ship, they aimed to drill through the thin veneer of Earth’s crust and grab a sample of the mantle, the 2900-kilometer-thick layer of dense rock that fuels volcanic eruptions and makes up most of the planet’s mass. The drill only got a couple hundred meters below the seabed before the project foundered under spiraling costs.
