An angiogram uses X-rays and a special dye (contrast) to take pictures of the arteries in your brain, heart, and kidneys. The dye is injected into a small tube or catheter into an artery in your groin or (sometimes) your arm.
As the cloud collapses the force of gravity drawing the cloud inward gradually becomes stronger because the strength of gravity follows an inverse square law with distance. hoâ¦pe that helps.
In their model, the momentum that a pyroclastic flow acquires is proportional to the height from which the eruption column collapses. The conclusion that momentum is the main cause of transport of pyroclastic flows influenced the energy line concept of Sheridan (1979).