Building Construction
Slate

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

ANSWER DOWNLOAD EXAMIANS APP

Building Construction
Rotary drilling

All listed here
Is not economical for holes of less than 10 cm
Is not suitable for deposits containing very coarse gravel
Hinders the ground water observations and permeability test

ANSWER DOWNLOAD EXAMIANS APP