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Earth science : ウィキペディア英語版
Earth science

Earth science or geoscience is an all-encompassing term that refers to the fields of science dealing with planet Earth.〔(【引用サイトリンク】title=earth science )〕 It can be considered to be a branch of planetary science, but with a much older history. There are both reductionist and holistic approaches to Earth sciences. The formal discipline of Earth sciences may include the study of the atmosphere, hydrosphere, lithosphere, and biosphere. Typically, Earth scientists will use tools from physics, chemistry, biology, chronology, and mathematics to build a quantitative understanding of how the Earth system works, and how it evolved to its current state.
== Fields of study ==
The following fields of science are generally categorized within the Earth sciences:
* Geography specifically Physical Geography covers aspects of geomorphology, soil study, hydrology, meteorology, climatology, and biogeography.〔(【引用サイトリンク】title=1(b). Elements of Geography – 2nd Edition, by M. Pidwirny, 2006 )
* Geology describes the rocky parts of the Earth's crust (or lithosphere) and its historic development. Major subdisciplines are mineralogy and petrology, geochemistry, geomorphology, paleontology, stratigraphy, structural geology, engineering geology, and sedimentology.〔name="smith 5">〕
* Geophysics and geodesy investigate the shape of the Earth, its reaction to forces and its magnetic and gravity fields. Geophysicists explore the Earth's core and mantle as well as the tectonic and seismic activity of the lithosphere.〔〔(【引用サイトリンク】title=WordNet Search – 3.1 )〕〔(【引用サイトリンク】title=NOAA National Ocean Service Education: Global Positioning Tutorial )〕 Geophysics is commonly used to supplement the work of geologists in developing a comprehensive understanding of crustal geology, particularly in mineral and petroleum exploration. See Geophysical survey.
* Soil science covers the outermost layer of the Earth's crust that is subject to soil formation processes (or pedosphere).〔(Elissa Levine, 2001, The Pedosphere As A Hub ) broken link?〕 Major subdisciplines include edaphology and pedology.〔(【引用サイトリンク】title=Duane Gardiner, Lecture: Why Study Soils? excerpted from Miller, R.W. & D.T. Gardiner, 1998. Soils in our Environment, 8th Edition )
* Ecology covers the interactions between the biota, with their natural environment. This field of study differentiates the study of the Earth, from the study of other planets in our Solar System; the Earth being the only planet teeming with life.
* Hydrology (includes oceanography and limnology) describe the marine and freshwater domains of the watery parts of the Earth (or hydrosphere). Major subdisciplines include hydrogeology and physical, chemical, and biological oceanography.
* Glaciology covers the icy parts of the Earth (or cryosphere).
* Atmospheric sciences cover the gaseous parts of the Earth (or atmosphere) between the surface and the exosphere (about 1000 km). Major subdisciplines include meteorology, climatology, atmospheric chemistry, and atmospheric physics.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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