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Unmanned space probes have yielded significant data on the surface features of many of the planets and their satellites.Since the 1970s even such distant planetary systems as those of Jupiter, Saturn, and Uranus have been explored by probes.The geologist is responsible for the discovery of minerals (such as lead, chromium, nickel, and tin), oil, gas, and coal, which are the main economic resources of the Earth; for the application of knowledge of subsurface structures and geologic conditions to the building industry; and for the prevention of natural hazards or at least providing early warning of their occurrence.(For further examples, Moon, for example, provided scientists with firsthand information on lunar geology, including observations on such features as meteorite craters that are relatively rare on Earth.The allied field of geophysics has several subdisciplines, which make use of different instrumental techniques.Seismology, for example, involves the exploration of the Earth’s deep structure through the detailed analysis of recordings of elastic waves generated by earthquakes and man-made explosions.Geomorphology is concerned with the surface processes that create the landscapes of the world—namely, weathering and erosion.Weathering is the alteration and breakdown of rocks at the Earth’s surface caused by local atmospheric conditions, while erosion is the process by which the weathering products are removed by water, ice, and wind.

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Thus the discipline of geomorphology is fundamental to the uniformitarian approach to the Earth sciences according to which the present is the key to the past.As a discipline, mineralogy has had close historical ties with geology.

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