Building Construction
Slate

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

ANSWER DOWNLOAD EXAMIANS APP

Building Construction
Gravels

Vary in size between 2 to 20 mm
Are cohesionless aggregates
All listed here
Never swell when they come into contact with water

ANSWER DOWNLOAD EXAMIANS APP