Elements of Geology (Classic Reprint) - Hardcover

Inhaltsangabe

Excerpt from Elements of Geology

The meaning and scope of geology. - Geology has to do with the history of the earth and of its inhabitants. Its field is so broad that for the sake Of convenience and specialized study it has been divided into numerous branches. Geology is concerned with the different members of the solar system and with other heavenly bodies in so far as they yield evidence as to the origin of the earth, or affect the activities now in progress upon it. This division of the general subject is some times called Astronom'ic Geology, and is related closely to the science of Astronomy. The processes and agents at work changing the earth must be studied carefully by the geologist, for they are shaping the present chapter in the history of the earth, and an understanding of them affords also a key by which much of its earlier history, recorded in the rocks, may be read. This phase of the subject is Dynamic Geology, and it has common ground with the special science of Physi ography or Physical Geography, with Meteorology, the science of the atmosphere, and with other sciences. The study of the remains and impressions 'of the plants and animals of past ages that are found in the' rocks is Paleontology; it is really the historical side of Botany and Zoology. Structural Geol ogy is concerned with the arrangement of the materials of the earth. That branch of geology which deals with minerals is Mineralogy, that which studies rocks is Petrology; both are connected closely with Chemistry. There are still other divisions of geology, but the ones mentioned are chief, and.

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