A block of ice that is 1,000 feet (305 m) thick is close to breaking off of Antarctica. It will break off of an ice shelf that has been in existence for thousands of years. Scientists believe a giant crack in the ice could cause an iceberg the size of Delaware to break off of Antarctica within days or weeks. They drew these conclusions by looking at satellite images of the crack. Not much can stop this even from occurring. If it does, the Larsen C ice shelf will lose more than 10 percent of its area. If the entire ice shelf were to crumble, the sea level could raise by 4 inches (10 cm) over the years.