<em>Kidney stones can stay in the kidney or travel down the urinary tract. A small stone may pass on its own, causing little or no pain. A larger stone may get stuck along the urinary tract. When a stone gets stuck it can block the flow of urine this causes severe pain and bleeding.</em>
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The Tectonic Forces is responsible in that creation
It's the convection currents that happen in the asthenosphere part of the Earth Crust , causing the African Plates to Diverge and continuously produce Rifts that will eventually formed a rift valley
This process can take millions of years
North America is bordered in the north by the Artic Ocean, in the east by the Atlantic Ocean, and in the west by the Pacific Ocean. Also, the Caribbean Sea is to North America's southeast.
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