51. The layer of the earth, immediately below the crust, is called

A. outer core
B. inner core
C. inner mantle
D. outer mantle

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52. The highest mountains in Africa, which is not part of any mountains chain, is

A. Mt. Aconcagua
B. Mt. Kilimanjaro
C. Mt. Kosciuszko
D. Mont Blanc

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53. The heavier silicates named as ‘Sima’ or silica + magnesium are most abundant in the

A. crust
B. core
C. mantle
D. ocean floors

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54. The imaginary line on the earth’s surface, which closely follows the 180 º meridian, is called the

A. International Date Line
B. Tropic of Cancer
C. Equator
D. Prime Meridian

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55. The largest part of our hydrosphere is

A. Atlantic Ocean
B. Indian Ocean
C. Pacific ocean
D. Antarctica ocean

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