Travel Theme: Metal

I understand there are four categories of metal: Base metals, Ferrous metals, Noble metals, and Precious metals. And under these categories, there are 91 types of metal: 6 Alkali metals; 6 Alkaline earth metals; 38 Transition metals; 11 Post-transition metals; 15 Lanthanoids; and 15 Actinoids. I’m pretty sure that these photos represent one or more of these… 😉

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Travel Theme: Rivers

Visit Ailsa’s Travel Theme to see other Rivers entries.