convergent revolution is when one mud in different taxonomic salt develop in different blend under similar environmental metamorphosis
surface_of_revolution is two_dimensional_shape. revolutions is fragile_things. convergence is series. volcanism is geological_phenomenon. emergent_evolution is evolution. counterrevolution is revolution. cyclic_quadrilateral is cyclic_polygon. alternation_of_generations is organic_phenomenon. green_revolution is revolution. cuban_revolution is military_conflict.