U.S. Geological Survey maps of the shafts and tunnels of the Comstock mines, published in 1881. The different colors used indicate each separate hundred feet of depth. From the David Rumsey collection in the Harvard University digital map library http://vc.lib.harvard.edu/vc/deliver/~maps/012019310
What natural occurrence can transform a landscape in minutes and affect the global climate for years? If you answered volcanoes, you’re right! Help kids grasp a better understanding of volcanoes with this infographic.
Doggerland is the name of a vast plain that joined Britain to Europe for nearly 12,000 years, until sea levels began rising dramatically after the last Ice Age. Taking its name from a prominent shipping hazard—Dogger Bank—this immense landbridge vanished beneath the North Sea around 6000 B.C. It was a busy thoroughfare for ancient hunters and gatherers. But archaeologists hardly gave it a thought until 2002, when British researchers saw seismic survey data from the petroleum industry.