World Geography
The process that may cause physical weathering or mechanical rupture are

None of these
crystallization, carbonation, thermal insolation
abrasion, oxidation, hydrolysis
abrasion, crystallization, pressure release

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World Geography
The Penumbra is

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

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