Earth's human population reached ____________________ in 2011 and is prjected to be ____________________ in 2045.
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Q23: Physical geology is the study of _.
Q23: Earth's six principal subsystems are _,_,_,_,_,and _.
Q35: The four basic forces are _,_,_,and _.
Q36: The two primary materials that geologists use
Q46: Theories are formulated through the process known
Q53: Earth formed _ billion years ago.
Q54: Earth's solid portion is divided into concentric
Q55: A combination of related parts that interact
Q56: The crust and the underlying uppermost mantle
Q59: The material in Earth's inner core is
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