Mostly Trivial 187

Coral Reefs [trivia]

This word was introduced by mariners and signify underwater ridge or rock derivation organic as well as inorganic, being a danger to ships.

Today this term refers only to organic structures, originated from accumulation of reef-builders' skeletons (today the main reef builders are corals... that's why the most common reefs are coral reefs!) 

Reefs have dense structure resistable to wave action. The fastest growth of reefs are in coastal water zone on depth not bigger than 32 feet. 

Many organisms have been built reef-like structures since the begin of Paleozoic era (about 570 millions ago...whew!). There were Archaecyatha (they had been living only during the Cambrian period) and Algae. 

For comparison Homo sapiens has exist on Earth for 200 thousand years; Earth has 4,6 billion years... WOW.

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What Do You Know , Joe?

The Latin name of this coral reef predator, is a threat to the Great Barrier Reef.

Last Posts Answer: C: 17 feet 6 inches 

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