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http://kids.britannica.com/comptons/art-156130/A-diagram-shows-the-relationship-between-volcanic-activity-and-Earths
您即将离开知乎,请注意您的帐号和财产安全。
http://kids.britannica.com/comptons/art-156130/A-diagram-shows-the-relationship-between-volcanic-activity-and-Earths