Some conditions can cause the absence of OAE's. These include: cysts, external otitis (swimmer's ear for example), stenosis, or abnormal middle ear pressure, a perforated ear drum, otosclerosis, cholesteatoma.
The Gulf of Mexico (Spanish: Golfo de MÃ©xico) is an ocean basin largely surrounded by the North American continent. It is bounded on the northeast, north and northwest by the Gulf Coast of the United States, on the southwest and south by Mexico, and on the southeast by Cuba.
The geology of the Gulf of Mexico has been reviewed by numerous authors. Two syntheses stand out. Grover Murray's 1961Geology of the Atlantic and Gulf Coastal Province of North America summarized classic mid-20th century stratigraphic and structural understanding of the basin.