Q 5. Give geographical reasons:
(A) There is variety in the interior of
the earth.
(B) There is correlation between the density
of metals and their location in the
interior of the earth.
(C) Mantle is the centre of earthquake and
volcanic eruptions.
(D) The thickness of the crust below the
continents is less as compared to oceans.
(E) Earth is protected because of the
magnetosphere
Answers
Answer:Q-1 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.
Q-2 Higher the density of the metal, farther away it will be found from the surface of earth. This is because lower density metals floated towards the surface of earth during the formation of the crust, while metals with higher density were pushed closer to the mantle.
Q-3 Mantle is the centre of earthquakes and volcanic eruption because from the mantle lava and magma arises. Mantle is the part of earth lying beneath earth's crust. It has molten rock in it and also the epicentre of the earthquake is always there in the mantle.
Q-4 The crust below the continent is thicker than that below the ocean. The average thickness below the continent is 35-40 km while that below the ocean is 7 km. The crust below the ocean though is denser.
Q-5Life on Earth initially developed and continues to be sustained under the protection of this magnetic environment. The magnetosphere shields our home planet from solar and cosmic particle radiation, as well as erosion of the atmosphere by the solar wind - the constant flow of charged particles streaming off the sun.
Answer:
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