The Census' official definition of money income excludes food stamps and the EITC, for example, while CBO includes it. Between 1979 and 2011, gross median household income, adjusted for inflation, rose from $59,400 to $75,200, or 26.5%. This compares with the Census' growth of 10%.
It takes a long time for the tiny coral polyps to create an entire reef. Coral formations grow an average of 1 to 8 inches per year. While ancestors of today's coral date back 240 million years, today's reefs began growing more than 50 million years ago, although most reefs are about 5,000 to 10,000 years old.oral Types. Coral comes in two types -- hard corals and soft corals. Hard corals grow in colonies and are responsible for the unique rock-like formations associated with coral reefs. Soft corals look like plants.
Australia's Great Barrier Reefâthe world's largest coral reefâis a unique marine ecosystem threatened by global warming. Damage to the reef could harm the region's biodiversity, tourism, and fisheries. The reef has suffered eight mass coral bleaching events since 1979, triggered by unusually high water temperatures. 1  If there is enough time between bleaching events, the coral can often recover.