Geology (from the Ancient Greek γῆ, gē, i.e. "earth" and -λoγία, -logia, i.e. "study of, discourse") is an earth science concerned with the solid Earth, the rocks of which it is composed, and the processes by which they change over time. Geology can also refer to the study of the solid features of any terrestrial planet or natural satellite, (such as Mars or the Moon).
Andrew Herbert Knoll. Gaidos E, Knoll AH. Frontiers of Astrobiology. Cambridge: Cambridge University Press; 2012. Our evolving planet: From dark ages to evolutionary renaissance. pp. 132–153.
Josiah Gilbert Holland, in Rev. S. Pollock Linn Golden Gleams of Thought from the Words of Leading Orators, Divines, Philosophers, Statesmen and Poets, A.C. McClurg & Company, 1881, p. 280.
More than a billion people globally do not have enough clean water and 2.6 billion people lack adequate sanitation. Italian researchers in a region challenged by drought plan to remedy that at both the local and global scale.
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