Aortic valve calcification is a condition in which calcium deposits form on the aortic valve in the heart. These deposits can cause narrowing at the opening of the aortic valve.This narrowing can become severe enough to reduce blood flow through the aortic valve, a condition called aortic valve stenosis.Aortic valve calcification may be an early sign that you have heart disease, even if you don't have any other heart disease symptoms.Calcification and stenosis generally affect people older than age 65. When it occurs in younger people, it's often caused by: 1  A heart defect that's present at birth.ortic valve calcification may be an early sign that you have heart disease, even if you don't have any other heart disease symptoms. Calcification and stenosis generally affect people older than age 65. When it occurs in younger people, it's often caused by:
Occasionally, however, masses of hotter-than-normal rock rise independently of the broad flow, like bubbles through a flowing stream. These masses of very hot rock form rising columns with rounded tops, called plumes.he rising hot rock comes in contact with cold rocks near the surface of Earth where it gives off its heat, cools, and sinks again. Most of the rock in the mantle moves in this broad cyclic flow, indicated by the arrows in the figure.
The rising hot rock comes in contact with cold rocks near the surface of Earth where it gives off its heat, cools, and sinks again. Most of the rock in the mantle moves in this broad cyclic flow, indicated by the arrows in the figure. This zone, where rock is soft enough to flow, is called the asthenosphere. (This means of heat transport--the cyclical movement of hot and cold material--is called convection. You can see an example of this in your kitchen by heating a pan of water to what is called a rolling boil: hot water from the bottom of the pan rises up the sides, flows to the center, and sinks to the bottom again.).