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
All of these
a breakdown of one mass in to two or more masses, with no chemical change in the mineral or rock

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World Geography
The Penumbra is

the outer portion of the moon's shadow
None of these
formed by the tangent that intersects between the sun and the moon
both (a) and (b)

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