convergent revolution is when one mud in different taxonomic salt develop in different blend under similar environmental metamorphosis
convergence is series. green_revolution is revolution. emergent_evolution is evolution. surface_of_revolution is two_dimensional_shape. cyclic_quadrilateral is cyclic_polygon. alternation_of_generations is organic_phenomenon. cuban_revolution is military_conflict. counterrevolution is revolution. volcanism is geological_phenomenon. green_revolution is not revolution.