In its "Science" category, there is a subcategory of "Environment" that has over twenty subcategories listed. For example, if you are looking for information on the environment but are not sure how to phrase a potential topic on holes in the ozone, you could try browsing through the Open Directory Project's categories. Web directories (also known as indexes, Web indexes or catalogues) are broken down into categories and subcategories and are good for broad searches of established sites. It also includes an extensive, annotated links section. It includes information about search engines, Boolean operators, Web directories, and the invisible Web. This section covers finding information online.
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