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.
An volcanic eruption is a place where hot melted rock called magma rises from deep inside the earth and erupts as lava out of the earth's crust. The world has three main types of volcanoes: Shield, Cinder, and Composite. The volcanoes in the Hawaiian Islands are Shield type volcanoes with long gentle slopes.fter many thousands of eruptions over a long period of time, the volcano mountains eventually grow to rise above the ocean to become islands. This is how the Hawaiian Islands were made. Here is a diagram of recent lava flows from the Kilauea volcano on the Big Island on February 4, 2011.