Coral polyps also use the energy supplied by their symbiotic algae to produce calcium carbonate, or limestone. They secrete the limestone from their base, creating a protective skeleton and a hollow chamber called a cup. The polyps retreat into their cup to hide when predators come looking for them.
Uranium is mined where there are concentrations in the earthâs crust. More than half of the worldâs uranium comes from mines in Canada, Australia and Kazakhstan.Other major producers are the United States, South Africa, Namibia, Brazil, Niger and Russia.Many more countries have smaller deposits that could be mined if needed.ore than half of the worldâs uranium comes from mines in Canada, Australia and Kazakhstan. Other major producers are the United States, South Africa, Namibia, Brazil, Niger and Russia. Many more countries have smaller deposits that could be mined if needed.
Native copper can be found in alluvial deposits, granitic and basaltic rock. The biggest ores of copper are the minerals chalcopyrite and malachite. Copper is mined throughout the world and the open pit mines created are the largest man-made excavations in the world.The top copper mining countries are Chile, U.S.A., Peru, China, Australia, Indonesia, Russia, Canada and Zambia.Copper is found in many other countries as well, it's a pretty extensive list.he top copper mining countries are Chile, U.S.A., Peru, China, Australia, Indonesia, Russia, Canada and Zambia. Copper is found in many other countries as well, it's a pretty extensive list.