The process is called microbial carbonate precipitation. The bacteria produces an enzyme that breaks down urea in the urine, forming calcium carbonate, which then binds the sand into rock hard ...

Urine contains water, urea and salts. Urea is produced in the liver when excess amino acids are broken down. Urea is the main waste product removed in the urine, as it is not reabsorbed in the kidney.

A triangle pointing right which indicates this type of media can be played. Stunning timelapse video shows the northern lights from space thanks to a solar storm A triangle pointing right which ...