Building Construction
Slate

Has a smooth surface and contains alumina and silica
Splits into thin sheets along its bedding planes
Is a metamorphic rock
Possesses good water absorption capacity

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Building Construction
Negative skin friction

Both (A) and (B)
Neither (A) not (B)
Develops due to lowering of ground water
Is a downward drag acting on a pile due to downward movement of the surrounding compressible soil relative to the pile

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