Continuous positive airway pressure (CPAP) machines are used to maintain an open airway in patients diagnosed with obstructive sleep apnea. The machine functions by blowing pressurized air into the airway via mask at a setting determined by sleep study and prescribed by a physician.
Also the second largest impact structure on Earth, the 1.85 billion years old Sudbury crater in Canada, hosts world-class mineral deposits - in this case nickel-rich minerals that were melted and concentrated by the extreme heating caused by the impact.
U.S. Route 13 to S.R. 184. The Chesapeake Bay impact crater was formed by a bolide that impacted the eastern shore of North America about 35.5 Â± 0.3 million years ago, in the late Eocene epoch. It is one of the best-preserved wet-target or marine impact craters, and the largest known impact crater in the U.S.