11). Days and nights are caused by : 1.revolution of the earth on its axis 2.revolution of the earth around the sun 3.inclination of the earth's axis
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12). The speed of rotation of the earth is the highest :
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13). "Mohs'Scale" is used to indicate the :
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14). Match the following : A. Lithosphere 1. The relatively light rocks that form the continental crust B. Aesthenosphere 2. The relatively dense rocks that form the oceanic crust C. Sima 3. Part of earth's upper mantle D. Sial 4. The outer portion of the earth including the crust Below options are given in A B C D order
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15). At neap tide : 1. the sun and moon exert their force at right angles 2. the tidal altitude is high 3. the low tides are very low
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16). If a solar eclipse occurs when the moon is quite far from the earth, the eclipse would be likely to be :
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17). What can be the maximum duration of totality for a solar eclipse?
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18). Which of the following are true regarding the crust of the earth? I. It is the outer thin layer with a total thickness of about 100 km II. It forms around 0.5 percent of the earth's volume III. The outer covering of the crust is of sedimentary material IV. The lower layer of the crust consists of basaltic and ultra-0basic rocks
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19). The total surface area of earth is :
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20). What is the approximate equatorial circumference of the earth?
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