Building Construction
Slate

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

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Building Construction
Auger boring

Is most economical up-to a depth of 5 meters
Is generally employed in cohesive and other self soils above water table
All of these
Is the most primitive method for making a hole in the ground

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