Answer: Ablation is a procedure that's been available now for 10 or 15 years or more, that is to eliminate heart rhythm disorders mostly now in what we call the upper chamber, or the atrium.nswer: Ablation is a procedure that's been available now for 10 or 15 years or more, that is to eliminate heart rhythm disorders mostly now in what we call the upper chamber, or the atrium.
Cumulus clouds look like fluffy tufts of cotton floating in the sky. Sometimes they might take the shape of a dragon, a turtle or some other creature. Cumulonimbus clouds are large, flat clouds that spread across the sky. One end of the cloud might be shaped like an anvil.
Cloud Types. Clouds are classified into four basic categories, depending largely on the height of their bases above the ground. High-level clouds, called cirrus clouds, can reach heights of 20,000 feet (6,000 meters) and are typically thin. They do not produce rain and often indicate fair weather.