Over the last 30 years man-made CFCs have been the main cause of stratospheric ozone depletion. CFCs however, are not the only ozone-depleting chemicals. Other ODCs include the methylhalides, carbon tetrachloride (CCl4), carbon tetrafluoride (CF4), and the halons which contain bromine instead of chlorine.
Part of the Internet applications glossary: Yahoo! is an Internet portal that incorporates a search engine and a directory of World Wide Web sites organized in a hierarchy of topic categories.
Google has become the standard search engine of virtually every web-goer on the internet today. In fact âto Googleâ is pretty much synonymous with âto searchâ. But that certainly doesnât mean that other search engines canât do a decent, if not better, job and this list has been compiled for just this reason.