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.
Medicare Part A is also called hospital insurance, and it covers most of the cost of care when you are at a hospital or skilled nursing facility as an inpatient. Medicare Part A also covers hospice services. For most people over 65, Medicare Part A is free. The following list gives you an idea of what Medicare Part A pays for, and does not pay for, during your stay in a participating hospital. However, even when Part A covers a cost, there are significant financial limitations on the length of coverage, as you'll see below.