solid oxygen appears in three modifications: α(below 23.5° K.); β(23.5°â€“43.5° K.); and γ(43.5° K. and melting point). In connexion with our investigations on the structure of solidified ...
The Earth's structure. Planet Earth is not a solid ball of rock ... of the tectonic plates that make up the Earth's crust. For example, iron is mined from the Earth's crust in quarries.
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