Building Construction
Gravels

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

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Building Construction
Auger boring

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

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