Consider the following tree diagram: 
What is the height of the subtree with root R?
Definitions:
Volcanic Mountain Belt
A volcanic mountain belt refers to a large-scale geographic area dominated by a series of volcanoes, often associated with plate boundaries, where subduction, rifting, or hotspots activities facilitate magma ascent to the surface.
Continental Drift
Continental drift is the historical scientific theory that continents have moved across the Earth's surface over geologic time, a precursor to the theory of plate tectonics.
South Atlantic Drift
A significant ocean current in the southern Atlantic Ocean that circulates warm water and influences climate patterns in the surrounding regions.
Vertical Hierarchy
An organizational structure where power and authority are concentrated at the top, and decisions flow downward.
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