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A volcano is a vent in the surface of the Earth through which magma and gasses erupt. Volcanic eruptions are among the Earth's most powerful and destructive forces, but volcanoes are also creative. Volcanoes have also shaped the Earth's landscape, as many of our mountains, islands, and plains have...
Grade Level   5 6 7 8
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2
How do geologists understand the Earth’s history? In part, they measure the age of rocks and other natural materials by dating techniques. They can date rocks by gauging the amount of decay of radioactive elements. The time necessary for half of any given amount of one element (the “parent...
Grade Level   5 6 7 8 9
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3
Core samples are small portions of a formation taken from an existing well and used for geologic analysis. The sample is analyzed to determine porosity, permeability, fluid content, geologic age, and probable productivity of oil from the site. Drilling is the only way to be sure that oil and gas...
Grade Level   5 6 7 8 9
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4
"The """"Blue Goose"""" has been the symbol of the National Wildlife Refuge System since it was first drawn by Pulitzer Prize-winning cartoonist J.N. """"Ding"""" Darling, one of the greatest supporters of wildlife conservation in the 20th century. Naturalist and author Rachel Carson had a reminder...
Grade Level   3 4 5 6 7 8
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5
"Crucial to our existence, water sustains all life on Earth. Following the old adage, """"""""What goes around comes around-"""""""" water moves continuously through the stages of the hydrologic cycle (evaporation, condensation, and precipitation). How does our drinking water fit into this...
Grade Level   K 1 2 3 4
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6
Published in 2007
Hurricanes are among the most common and most destructive types of natural hazards on Earth. Because they occur across space and time, hurricanes can be better understood using maps, particularly digital maps within a Geographic Information Systems (GIS) environment. GIS allows you to use maps as...
Grade Level   9 10 11 12
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