Describe the structure of the earth
Answers
Answer:
Explanation:
Structure of the Earth. The interior of the Earth, like that of the other terrestrial planets, is chemically divided into layers. The Earth has an outer silicate solid crust, a highly viscous mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core
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Answer:
Earth can be divided into the crust, upper mantle, lower mantle, outer core, and inner core.
Explanation:
The Earth's crust ranges from 5–70 kilometres (3.1–43.5 mi)[4] in depth and is the outermost layer.[5] The thin parts are the oceanic crust, which underlie the ocean basins (5–10 km) and are composed of dense (mafic) iron magnesium silicate igneous rocks, like basalt. The thicker crust is continental crust, which is less dense and composed of (felsic) sodium potassium aluminium silicate rocks, like granite
Earth's mantle extends to a depth of 2,890 km, making it the thickest layer of Earth.[7] The mantle is divided into upper and lower mantle,[8] which are separated by the transition zone.[9] The lowest part of the mantle next to the core-mantle boundary is known as the D″ (pronounced dee-double-prime) layer.[10] The pressure at the bottom of the mantle is ≈140 GPa (1.4 Matm).[11] The mantle is composed of silicate rocks that are rich in iron and magnesium relative to the overlying crust.[12]
The average density of Earth is5.515 g/cm3.[16] Because the average density of surface material is only around 3.0 g/cm3, we must conclude that denser materials exist within Earth's core. This result has been known since the Schiehallion experiment, performed in the 1770s. Charles Hutton in his 1778 report concluded that the mean density of the Earth must be about {\displaystyle {\tfrac {9}{5}}} that of surface rock, concluding that the interior of the Earth must be metallic. Hutton estimated this metallic portion to occupy some 65% of the diameter of the Earth