SUBDUCTION ZONES and ISLAND ARCS. Subduction Zones are where cool lithospheric plates sink back into the mantle. It takes about 50 my for the ocean lithosphere that formed in the hot (>1000C) environment at mid-ocean ridges to cool to an equilibrium state and sink to its maximum depth below sea-level.
Ebola hemorrhagic fever is a viral disease caused by Ebola virus that results in nonspecific symptoms (see symptom section of this article) early in the disease and often causes internal and external hemorrhage (bleeding) as the disease progresses.
All previous Ebola outbreaks occurred in countries with a number of long-tenured infectious diseases that mimic the early symptoms of Ebola and help keep the disease hidden. The initial symptoms of malaria, for example, are indistinguishable from those of Ebola. Cholera is likewise endemic in the area and caused a large outbreak in Guinea and Sierra Leone in 2012 that lasted most of that year.