This Earth science investigation leads students through a brief introduction of the spheres of the Earth and an exploration of the interactions among the spheres. The seven-step investigation incorporates a mixture of informational text, questions, and images. After reading about and interacting with an image of the four main spheres (the atmosphere, hydrosphere, geosphere, and biosphere), students are introduced to the concept of sphere interactions as part of the larger Earth system. Text, questions, and some sample answers assist students in identifying sphere interactions in the various images shown. In the last step of the investigation, students are asked to contemplate the global effects of human population growth on the spheres. To assist students with this question, the final page contains a globe showing human population density. Arrows permit students to turn the globe to view the population data for all parts of the world. Copyright 2005 Eisenhower National Clearinghouse


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    Informal Education,Atmosphere,Middle School,NSDL,Biosphere,Geosphere,Grade 8,Grade 9,Earth and space science,Hydrosphere,NSDL_SetSpec_1007936,Ecology, Forestry and Agriculture,High School,Grade 10,Space Science,Grade 12,Earth system structure,oai:nsdl.org:2200/20120114184116867T,Geoscience,Grade 11



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