Grade 8, human impact, unit 4

Jun 04, 2012 · List 4 ways humans cause extinctions. How can endangered species be saved? Unit 4: Review in your textbook - Chapters 11, 12.1, 12.3, 13. What is the water cycle? Why is groundwater important? What are the positive and negative effects of building a dam? Compare point-source pollution and non-point pollution. Give an example of each. ................
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