Because they are continuously eroded by the rushing water running past them.
umm erosion?
Amorphous sediment in urine are things like crystal phosphates, uric acid stones or calcium stones that are found in the urine. Certain amorphous sediment found in urine is normal. The cause of amorphous sediment depends on the type of sediment. For instance, uric acid stones can be caused from not drinking enough liquids.
Abnormal crystals and amorphous sediment are findings in a urine test, not a blood test. Suggests stones.
Measure space to be arched, width, and arch height. Determine size of stones to be used. Determine number of stones. Divide angular width of arch by number of stones, to determine cut angle of stones. Build temporary support, lay stones, starting at each end, working upward, mortar (or not). Lay capstone. Remove temporary support.
It has become the "gold standard" for diagnosis of stones in the gallbladder, but is less accurate in diagnosing stones in the bile ducts
Ancient discoveries, where people as long ago as 6,000 BC picked up alluvial stones from the ground that had been washed downstream by running water, running over volcanic pipes that brought the stones to the surface of the earth.
Sediments.......to create a sedimentary rock.....
The Beatles
no they were before
They haven't and they probably never will.
1964
As the gizzard stones wear down they become small enough to pass out of the gizzard and will pass harmlessly out.