 | Plate tectonic and continental drift reconstruction images by: Dr. Ron Blakey Northern Arizona University |
 | This file enables you to explore a controversial geographic area - the Arctic National Wildlife Refuge. You can learn more about the potential consequences of drilling for oil in the wilderness of Northern Alaska, most notably the impact on the environment and wildlife. |
 | Active Volcanoes of the World from Smithsonian Institution |
 | This prominent circular feature in the Sahara desert of Mauritania has attracted attention since the earliest space missions because it forms a conspicuous bull’s-eye in the otherwise rather featureless expanse of the desert. It is thought to be merely a symmetrical uplift (circular anticline or dome) that has been laid bare by erosion. |
 | Hvor gammel er havbunnen? Fra San Diego State University. |
 | Yosemite National Park in California is visited by millions of people every year who go to see the spectacular scenery. In this KML, you can explore an individual's experience of a hike to the famous "Half Dome". Viewing tip: Turn on "Terrain" in your layers section. |
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