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
The process involving stones rolling along the riverbed is called "bedload transport." This occurs when the flow of water in the river provides enough energy to move larger sediment particles, such as gravel and stones, along the bottom of the river. The rolling motion is primarily caused by the force of the water pushing against the stones, causing them to tumble and shift position. This process contributes to the river's erosion and sediment transport dynamics.
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.....
no they were before
The Beatles
1964
They haven't and they probably never will.