The Environmental Collection Digital Dictionary eBook is a dictionary, in PDF form, that helps students to learn the concepts of water vapor as a greenhouse gas, the hole in the ozone layer, overfishing, coral bleaching, fracking, and deforestation. They can also use this powerpoint to quiz themselves on the keywords, and look up the definitions they do not know. This is a great resource for centers, whole group instruction, and use on IPads, computers, and to post on class websites.