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If you are not content with the images provided with Windows 7, click the "Get more themes online" option. You will be taken to a page on the Microsoft Windows 7 Web site where you can choose from dozens more packs of art to download. Click the download link and choose "Open" from the dialog box that appears, your chosen theme will automatically be installed and activated. There are many reasons why geology is essential in life and to civilization. Think about earthquakes, landslides, floods, droughts, volcanic activity, ocean water currents (el Ni??o), kinds of soil, fuel oils, minerals (gold, silver, uranium), and the like. Geologists study all of these concepts. Thus, the research into geology plays a crucial role in todays modern life and civilization.