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Question
The habitable part of earth's crust is about
The habitable part of earth's crust is about
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Solution
The correct option is A 22.5 km
Moving from centre to surface, earth can be divided into three major layers namely; the core, the mantle and the crust. Core is the deepest and hottest layer of earth; the outer core consists of iron-nickel alloy along which small amount of heavy metals while the inner core is made up mostly of iron. The higher temperature, 7000-9000o F keeps the outer core in liquid state while higher pressure on inner core keeps it in solid state despite the high temperature conditions. Thickness of outer and inner core is 2259 km and 1221 km respectively. Mantle is 2900 km thick layer wherein most of the earth’s internal heat is located. The outer most layer of earth is crust; it is 22.4 km thick and forms the only habitable part of earth. It comprises continents (lithosphere) and ocean basin (hydrosphere) that support life. Thus, the correct answer is option A.
Moving from centre to surface, earth can be divided into three major layers namely; the core, the mantle and the crust. Core is the deepest and hottest layer of earth; the outer core consists of iron-nickel alloy along which small amount of heavy metals while the inner core is made up mostly of iron. The higher temperature, 7000-9000o F keeps the outer core in liquid state while higher pressure on inner core keeps it in solid state despite the high temperature conditions. Thickness of outer and inner core is 2259 km and 1221 km respectively. Mantle is 2900 km thick layer wherein most of the earth’s internal heat is located. The outer most layer of earth is crust; it is 22.4 km thick and forms the only habitable part of earth. It comprises continents (lithosphere) and ocean basin (hydrosphere) that support life. Thus, the correct answer is option A.
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