World Geography
The sidereal month may be defined as

the period in which the moon completes an orbit around the Earth and returns to the same position in the sky
the period of rotation of moon
the period in which the moon completes an orbit around the earth
None of these

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World Geography
The process of weathering results into

the complete loss of particular atoms or the compounds from the weathered surface
the addition of specific atoms or compounds to the weathered surface
a breakdown of one mass in to two or more masses, with no chemical change in the mineral or rock
All of these

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