Pearls are the only gemstones of organic origin and the second most valuable after diamonds. Given this, it's no wonder that pearl fishing, even if dangerous and exhausting, is an occupation widely spread on tropical coasts, from the shores of the Indian Ocean to the Gulf of Mexico and Panama. The "producers" of... |
29 April 2008
10:14 GMT |
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Snails make a group comprising over 75,000 species. Most snails are marine, but they also inhabit freshwater and terrestrial habitats, even dry ones. One group of sea snails are called Opistobranchia (the translation of the scientific name means "fore gills", as these organs, when existent, are located behind the vis... |
18 February 2008
10:39 GMT |
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At the bottom of the oceans, the lowest level of the ocean waters, submarine volcanoes are found. They erupt periodically, but also phenomena similar to others that accompany terrestrial volcanoes, such as submarine geysers, can be found and are called hydrothermal vents (hot vents) or black smokers. The submarine v... |
15 February 2008
09:39 GMT |
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1. There are 80,000 species of living mollusks, classified in Gastropoda (snails and slugs), Bivalvia (clams, oysters and scallops), Cepahlopoda (squids, cuttlefish and octopuses), Scaphopoda, Polyplacophora (chitons), Aplacophora, Monoplacophora, Caudofoveata. Because most mollusks have hard shells, many were fossil... |
25 January 2008
17:31 GMT |
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When we talk about longevity, our minds think about giant tortoises and crocodiles, elephants and other animals.Indeed, crocodiles can live as much as human beings and elephants do, also reaching the sixties. Giant tortoises are proved to live more than 200 years. And some ravens and parrots indeed live longer than o... |
29 October 2007
15:06 GMT |
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