If a substantial amount of calcium is discovered, coronary artery disease may be likely. A CT coronary angiogram, in which you receive a contrast dye injected intravenously during a CT scan, also can generate images of your heart arteries.
At converging plate boundaries, two situations are possible. First, both volcanoes and earthquakes form where one plate sinks under the other. This process, called subduction, takes place because one plate is denser than the other. The denser plate, which invariably has oceanic crust on its top, does the sinking. Second, only earthquakes occur when two plates collide (obduct), building a mountain range.
Most earthquakes happen at a place where 2 tectonic plates touch. Earthquakes occur mostly in regions with stress between continental plates. This is the case in the Middle East, and along the rim around the Pacific Ocean (where it also causes volcanic activity in the regions, known as the Ring of Fire).