1
"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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2
"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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3
"Since 1970, oil and natural gas have provided more than half of the energy used each year in the United States to produce electricity, heat, transportation fuels, and many everyday products from balloons to vitamins. Oil and natural gas are forms of petroleum, a word that literally means...
Grade Level   6 7 8 9 10 11 12
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4
One of the most frightening and destructive phenomena of nature is a severe earthquake and its terrible aftereffects. An earthquake is a sudden movement of the Earth, caused by the abrupt release of strain that has accumulated over a long time. For hundreds of millions of years, the forces of plate...
Grade Level   7 8 9 10 11 12
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