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 generally starts with flu-like symptoms. Though it's known for the extreme hemorrhagic symptoms -- the bleeding out of the eyes, etc. -- not everyone will experience these. In fact, only 20 percent of people will have [these extreme symptoms] Bhadelia said.
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.