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.
Similarly, liquid magma also turns into a solid &#8212 a rock &#8212 when it is cooled. Any rock that forms from the cooling of magma is an igneous rock. Magma that cools quickly forms one kind of igneous rock, and magma that cools slowly forms another kind.When magma rises from deep within the earth and explodes out of a volcano, it is called lava, and it cools quickly on the surface.Rock formed in this way is called extrusive igneous rock.agma that cools quickly forms one kind of igneous rock, and magma that cools slowly forms another kind. When magma rises from deep within the earth and explodes out of a volcano, it is called lava, and it cools quickly on the surface. Rock formed in this way is called extrusive igneous rock.