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Information sources, both online and in print, on physical and environmental geology and oceanography.
Reference sources are great places to begin research, especially if you are not very familiar with a topic. For example, an encyclopedia article can in a page or two show you the most important facts, events, people, statistics. This will help you understand more complex information you will use later.
These online databases from the library will lead to more reliable information than you usually get from a web search: