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.
There are complex factors which both add to the growth of a reef and take away from it. For instance, attack by certain organisms and wave destruction will contribute to a decline in reef size. On the other hand, a growing reef can trap sediments as they are moved along by currents, thus adding to its thickness.ack of light will of course kill a reefâno live coral growth takes place below about 50 metres under the surface. Hence thick atolls such as Eniwetok require the ocean floor to sink as the coral builds.