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.
What Is SEO / Search Engine Optimization? SEO stands for âsearch engine optimization.â It is the process of getting traffic from the âfree,â âorganic,â âeditorialâ or ânaturalâ search results on search engines.