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双语阅读 ‖ 珊瑚是什么? What Is Coral ?The hard, dry corals seen in stores and museums are made up of the combined skeletons of tiny creatures which once lived joined together as a colony in the sea. The coral animal, or polyp, measures only about a...
The whole planet is pretty much a big rock. Kids: Wow. Kids: Like when I go outside, I have lots of these little pebbles in front of my house. In my garden. Outside in the bush, the city, the waterways. Nij: How do they all get made? Nij: Yeah, we want to know how rocks...
Coral reefs would not exist if it were not for the ability of coral polyps to secrete limestone or calcium carbonate. Sea water surrounding a coral is very rich in dissolved calcium carbonate, but the fluid inside the polyp cannot retain a large quantity of calcium carbonate, so it is laid ...
following day (when the coral polyp is retracted and lying on its new structure), the valleys between the ridges fill in with more calcium carbonate and the skeleton takes on a smoother appearance.Because the skeleton of hard corals is made of limestone or calcium carbonate, it is pure white...
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Sharks are different from other fish in several ways. They have no bones! Instead, a shark’s skeleton is made of a materrial calledcartilage.Your nose and ears are made of cartilage. Most sharks have several rows of teeth. When a shark loses a tooth, another one moves up to take its...
What are coral reefs made out of? Coral Reefs: Coral reefs are one of the busiest underwater ecosystems. Many fish come to the coral reefs to feed and many people go diving at coral reefs for the views. And scientists are continually studying them. ...
Carbon emissions from human activity are causing ocean warming, acidification and oxygen loss. Coastal waters are deteriorating due to pollution which causes harmful algae blooms. With 90% of big fish populations depleted and half of all coral ree...
fishing, pesticide use, atomic testing, rain forest depletion, and over-population--but many marine biologists maintain that the epidemic is a natural feature of coral-reef life, and ecological "balance of nature" that should not be tampered with until we know the scientific truth of the ...