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Four snowy owls surveying their surroundings from logs at the beach. Boundary Bay Regional Park, Canada
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Four snowy owls surveying their surroundings from ...

A USGS team conducts a leveling survey on a volcanic mountain on August 24, 2006. The process involves precise measurements to monitor any changes in the landscape due to seismic activity or geologica...
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A USGS team conducts a leveling survey on a volcan...