A collection of geologic hazard photos from the NOAA National Geophysical Data Center (NGDC). Many of these photos were originally 35mm slide sets made available to educators and others. Now you can download them. Only problem is they are in TIF format, so you might want to convert them to JPG.
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RIS Ground Penetrating Radar (GPR) Systems can accurately and nondestructively “see” through solid pavement materials, such as asphalt, concrete and soil to detect subsurface objects and determine the condition and thickness of the material examined. […]