UDC: 55 Earth sciences. Geological sciences

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Common auxiliaries

## 5 Mathematics and natural sciences
55 Earth sciences. Geological sciences

550 | Ancillary sciences of geology etc.
551 | General geology. Meteorology. Climatology. Historical geology. Stratigraphy. Palaeogeography
551.1/.4 | General geology
551.1 | General structure of the Earth
551.2 | Internal geodynamics (endogenous processes)
551.3 | External geodynamics (exogenous processes)
551.4 | Geomorphology. Study of the Earth's physical forms
551.5 | Meteorology
552 | Petrology. Petrography
553 | Economic geology. Mineral deposits
556 | Hydrosphere. Water in general. Hydrology

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