aragonite
41Ooid — Modern ooids from a beach on Joulter s Cay, The Bahamas. Ooids on the surface of a li …
42Vaterite — (CaCO3) is a mineral, a polymorph of calcium carbonate. It was named after the German mineralogist Heinrich Vater. It is also known as mu calcium carbonate ( mu; CaCO3) and has a JCPDS number of 13 192. Vaterite, like aragonite, is a metastable… …
43Ocean acidification — Change in sea water acidity pH caused by anthropogenic CO2 between the 1700s and the 1990s Ocean acidification is the name given to the ongoing decrease in the pH and increase in acidity of the Earth …
44Gouffre d'Esparros — Coordonnées 43° 01′ 50″ Nord        00° 19′ 48″ Est …
45carbonate mineral — Any member of a family of minerals that contains the carbonate ion, CO32 , as the basic structural unit. The carbonates are among the most widely distributed minerals in the earth s crust; the most common are calcite, dolomite, and aragonite.… …
46CALCAIRES — Une roche est dite calcaire si elle renferme au moins 50 p. 100 de carbonate de chaux (CaCO3), généralement représenté par de la calcite , plus rarement par de l’aragonite ; les minéraux les plus fréquemment associés au carbonate de chaux dans… …
47Exoskeleton — The discarded exoskeleton of a dragonfly nymph An exoskeleton is the external skeleton that supports and protects an animal s body, in contrast to the internal skeleton (endoskeleton) of, for example, a human. In popular usage, some of the larger …
48Chiton — This article is about the mollusc. For the ancient Greek article of dress, see Chiton (costume). Chiton Temporal range: Devonian–Recent[1][2] …
49Debate about Cambrian Lophotrochozoans — Since 1990 there has been intense debate among paleontologists about the evolution in the Early Cambrian period of the super phylum Lophotrochozoa, which is thought to include the modern molluscs, annelid worms and brachiopods, as well as their… …
50Caves of Aggtelek Karst and Slovak Karst — Infobox World Heritage Site WHS = Caves of Aggtelek Karst and Slovak Karst State Party = HUN and SVK Type = Natural Criteria = viii ID = 725 858 Region = Europe and North America Year = 1995 Session = 19th Extension = 2000 Link =… …
