sumber

            dunia-mulyadi.blogspot.com
            goodwill.hol.es

http://dunia-mulyadi.blogspot.co.id/2016/03/materi-ipa-tentang-tanah-   dan-
https://www.youtube.com/watch?v=1LncN5YxIEY
keberlangsungan-kehidupan.html

kelompok4ti.blogspot.com

reduplicatory2rssing.com

yokiv.blogspot.com

www.sridianti.com

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