Types and applications of metals
The shine of the metal is silver, and the metal is very heavy. Duralumin and aluminum are light. But lead is heavy, and so is gold and platinum. Light metals are applied in cutting-edge industrial fields. In addition, there are metals necessary for electronic devices, and those metals are necessary.
難問
heating, heat pumps, warming, gases, greenhouse gases, atmospheric circulation, plants, gas exchange, animals, plants, insects, microorganisms, gaia, occult? Really?
空中を漂う空気塊
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