পর্ব 5: রুরি, ইয়োকো এবং নাগি পাথর ও খনিজের জন্য একটি বালুকাময় সৈকত অন্বেষণ করছেন।

Ruri, Yoko, and Nagi search a gravel beach, finding banded agates and other forms of quartz. Nagi speaks of rocks as fascinating clues to the formation and history of the world. A fleck of silvery metal proves anomalously dense in a simple test. It might be platinum, which is less rare in serpentinite from the Earth's mantle. Nagi provides a short review of volcanism and plate tectonics. In the mountains they find a big shiny block of serpentinite, and more platinum grains in a nearby stream. (Source: Wikipedia)

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