有任何疑问或需要帮助，请通过邮件或社交平台联系我们。您的反馈是我们改进的重要动力。 Oxygen is easily the most ample aspect in Earth's crust, creating up Nearly 50 percent on the Earth's crust in the shape of various oxides like h2o, carbon dioxide, iron oxides and silicates.[6] It's the 3rd-most abundant ingredient while in the universe immediately after hydrogen and helium. Air didn't https://agnese713pwd5.wikiconversation.com/user