____________________ is a lining of heavy rocks covering the vulnerable ground to protect the ground surface and slow the discharging velocity at the same time.

Name: ____________________ is a lining of heavy rocks covering the vulnerable ground to protect the ground surface and slow the discharging velocity at the same time.
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The Answer of ____________________ is a lining of heavy rocks covering the vulnerable ground to protect the ground surface and slow the discharging velocity at the same time.

____________________ Is a Lining of Heavy Rocks Covering the Vulnerable