write note on the core of the earth
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Answer:
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Explanation:
The Core It is the innermost part of the earth. It is separated from the mantle by the Guttenberg-Weichert discontinuity and extends upto the very centre of the earth. It constitutes around 17 percent of the volume and 34 percent of the mass of the earth.
Since the S-waves do not pass through the outer core, no information about the inner core is provided by them. It only suggests that the core, at least in its outer part, is fluid-like in its character because it does not transmit the S.waves and because it retards the velocity of P-waves from 12.6 to 8.4 km/sec.
The pressure and temperature in the core are both very high. The pressure is assumed to be over three million atmosphere and the temperature is around 6000°C . There is a sharp change in the density from about 5.5 x lO’kgm-3 in the mantle to about 10.6 x 103kgm~3 in the core, while at the centre of the core the density increases to 12 or 13xl03 kg nv3.
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Answer:
Explanation:
Earth's core is the very hot, very dense center of our planet. The ball-shaped core lies beneath the cool, brittle crust and the mostly-solid mantle.
The core is found about 2,900 kilometers (1,802 miles) below Earth's surface, and has a radius of about 3,485 kilometers (2,165 miles).