Geography, asked by ritikapatiyal9037, 6 hours ago

write short note on density and earth's interior​

Answers

Answered by yash90634
2

Answer:

The Earth's interior is made of a spherical shells sort of like an onion. The radius of the Earth is 6371 km. It has an average density of 5.5 g/cm3.

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Answered by anuragy2712
1

The Earth’s interior is made of a spherical shells sort of like an onion. The radius of the Earth is 6371 km. It has an average density of 5.5 g/cm3.

The structure of the Earth’s upper mantle can be derived from seismic waves. The main layers are the crust, the mantle and the core.

Let’s break them down into each section:

The Crust

The crust is the uppermost layer of the planet. It is between 5 and 80km thick. There are two types of crust, oceanic crust (found beneath the oceans) and continental crust. The oceanic crust is only 5-10km thick and made up mostly of basalt. The continental crust can be much thicker, up to 80km, and is made of less dense rocks such as silicate. The major element components of the crust are oxygen and silicon (Si) and thus the mantle is often referred to as the silicate mantle.

The Mantle

The mantle lies beneath the crust to a depth of about 2900km. The mantle has many layers within the upper and lower mantle. The upper layer is the lithosphere below which is the asthenosphere. The transition zone is the layer between the upper and lower mantle distinguished by the 410 km and 660 km discontinuities, as revealed by seismic evidence. The lower mantle has a D” layer just above the core-mantle boundary.

The Core

The Core is made up of two layers, the inner core and outer core. Seismic evidence tells us that the inner core is solid while the outer core is liquid. The inner core has a radius of 1 216 km and the total radius of the core is 3486 km. The core is composed mostly of iron (80%) and some nickel. The density of the inner ’solid’ core is between 9.9-12.2 g/cm3 and the outer core’s density is between 12.6-13 g/cm3.

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