aangellexith2885
02.07.2019 •
Chemistry
Which free elements are found in the earths crust
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Ответ:
These are the nine, withe their percentages. Oxygen (with 49.5 %), then silicon (25 %), aluminium (7.5 %), iron (4.7 %), calcium (3.4 %), sodium (2.6 %), potassium (2.4 %), magnesium (1.9 %) and hydrogen (1.9 %)
Ответ: