Basics of polymyalgia rheumatica. Polymyalgia rheumatica (PMR) is a disorder that causes stiffness and aching that begins in the neck, shoulder and hip areas. It is not known whether it is a disease of the joints muscles or arteries.However it is thought that inflammation in these areas leads to pain and stiffness.Incidence.olymyalgia rheumatica (PMR) is a disorder that causes stiffness and aching that begins in the neck, shoulder and hip areas. It is not known whether it is a disease of the joints muscles or arteries. However it is thought that inflammation in these areas leads to pain and stiffness. Incidence.
There are two main types of volcanic eruptions: Explosive and Nonexplosive eruptions.he types of volcanic eruptions are magmatic, phreatomagmatic, and phreatic. For a description of each type and different styles of each, refer to the link below.
Answers. Best Answer: Basalt eruptions are most prevalent in oceanic eruptions, at sea floor spreading zones and formation of island arcs. Felsic eruptions, which are typically granitic or rhyolytic, are more common in continental eruptions.The predominant eruptions are oceanic, so basaltic eruptions are more common.A theory of the evolution of a volcano maintains that eruptions of young volcanoes start out basaltic and become more and more felsic as the volcano matures. This is thought to be to magma differentiation and fractionation. Source(s):elsic eruptions, which are typically granitic or rhyolytic, are more common in continental eruptions. The predominant eruptions are oceanic, so basaltic eruptions are more common.