Give reasons - There are discontinuities in the interior of the earth
Answers
Answer:
The discontinuities are caused by the fact that the whole of the Earth was once molten - ie a ball of liquid.
Some of the liquids were immiscible - in other words like oil and water they didn’t mix and started to settle out. The principle immiscible liquid was iron, which being dense settled out towards the centre of the liquid ball. The iron took certain other siderophile elements with it like nickel, gold and uranium.
The remainder of the liquid comprising about 85% in all, and consisting of oxygen, magnesium, silica and other elements slowly cooled. Higher melting point minerals settled out of the mixture first.
The lightest minerals containg a high percentage of silica floated to the top and today form the continents.
Some of the layering in the Earth today is a result of pressure. Olivine for example is a predominent mineral in the upper mantle, but is unstable below about 500 kilometers and is transformed into wadsleyite. Wadsleyite has a density 3.84 compared to olivine at 3.32. Seismic waves in general are faster in denser material.
Explanation:
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Answer:
The core, the mantle and the crust forms the layer of the interior earth.
The interior of earth is made of different types of materials varying in physical and chemical properties like temperature, density, mass etc.
Each layer is separated by a transition zone called discontinuities.
Conrad, Mohorovicic, Repiti, Gutenberg and Lehman are the five types of discontinuities found in the earth’s interior.