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.
Our Terms of Service and Privacy Policy have changed. By continuing to use this site, you are agreeing to the new Privacy Policy and Terms of Service. Medicare Part A provides coverage if you're hospitalized. This coverage is free - meaning you pay no premiums - if you paid into the Social Security pool for at least 10 years.