Built To Last. The dam itself was built to last. It was built to be as tough as the canyon walls which surround it. A total of 3,250,000 cubic yards of concrete was poured to create the dam â itâs enough to build a monument 100 feet square and 2 1/2 miles high.uilt To Last. The dam itself was built to last. It was built to be as tough as the canyon walls which surround it. A total of 3,250,000 cubic yards of concrete was poured to create the dam â itâs enough to build a monument 100 feet square and 2 1/2 miles high.
Report Abuse. The main function of the eyebrow is to prevent moisture, mostly salty sweat and rain, from flowing into the eye, an organ critical to sight.
A purpose of the eyelids that you might not think of is that they help keep the surface of the eye moist by spreading tears and other natural secretions. Tears & Secretions. There's a clear, moist membrane that lines the inner surface of your eyelids and the outer surface of the eyeball called the conjunctiva. This delicate membrane secretes mucus, which helps keep your eye moist. Keeping the eye moist is an important job, but because the conjunctiva is a continual membrane, it serves another interesting purpose.