ERAs 7 and 8 Overview: TWENTIETH CENTURY 2 HUMANS AND THE EARTH - PowerPoint PPT Presentation

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ERAs 7 and 8 Overview: TWENTIETH CENTURY 2 HUMANS AND THE EARTH

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... off unwanted animals such as rats and wolves. Diverting rivers. Clearing forests ... Have made many rock forms. Have shaped the earth and seas in profound ways ... – PowerPoint PPT presentation

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