What type of pacemaker is evident in this ECG tracing? 
Definitions:
Sulfide Minerals
Minerals composed of sulfide ions and one or more metals; important as ore minerals and for their chemical properties.
Fast-Spreading Ridge
A geological feature where tectonic plates are diverging at a rapid rate, leading to significant volcanic activity and the formation of new oceanic crust.
Hydrothermal Vents
Hydrothermal vents are openings in the sea floor from which heated mineral-rich water flows, often located near volcanically active places.
Hydrogen Sulfide
A toxic, foul-smelling gas, H2S, often associated with volcanic gases and the decomposition of organic matter.
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