leaching. Phosphate leached from guano phosphatizes the underlying rocks in some areas, forming apatite where the host rock is limestone and forming aluminum- or aluminum-iron-phosphate minerals where the underlying rock is a silicate. Individual deposits of both igneous apatite and marine phosÂ­
Medicare Part B (Medical Insurance) covers diagnostic hearing and balance exams if your doctor or other health care provider orders these tests to see if you need medical treatment. Medicare doesn't cover routine hearing exams, hearing aids, or exams for fitting hearing aids.
What is Part B? Medicare Part A and Part B, together, are called Original Medicare. Through the Center for Medicare &Medicaid Services, the United States government set up Original Medicare to cover a wide range of medical expenses for individuals 65 and older and individuals with certain disabilities. Part A is hospital insurance.