Building Construction
The lintels are preferred to arches because

Arches require strong abutments to withstand arch thrust
Arches require more headroom to span the openings like doors, windows etc.
All of these
Arches are difficult in construction

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Building Construction
Gravels

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

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