Difference between revisions 1586872 and 1609884 on enwikiversity

[[Image:Ice cap.jpg|thumb|right|200px|This is an aerial image of the ice cap on Ellesmere Island, Canada. Credit: National Snow and Ice Data Center.]]
'''Earth''' is rocky astronomical object, a liquid object, a gaseous object, and a plasma object.
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==Astronomy==
{{main|Astronomy}}
[[Image:Greenland 42.74746W 71.57394N.jpg|thumb|right|200px|Satellite composite image shows the ice sheet of Greenland. Credit: NASA.]]
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|accessdate=2016-02-06 }}</ref> is called '''Earth'''.

==Geognosy==
{{main|Earth/Geognosy|Geognosy}}
[[Image:Slice_earth.svg|thumb|200px|float|right|This diagram is a theoretical interior for the rocky object called the [[Earth]] by its hominid inhabitants. Credit: [[commons:User:Dake|Dake]].]]
[[Image:Earthquake wave paths.svg|thumb|right|200px|Seismic velocities and boundaries are diagrammed for the interior of the [[Earth]] sampled by seismic waves. Credit: .]]

[[Image:Earth-crust-cutaway-English-Large label.PNG|thumb|||This is a cutaway illustration of the interior of the [[Earth]]. Credit: Washiucho and [[commons:User:Brews ohare|Brews ohare]].]]⏎
The diagram on the right is a theoretical interior for the Earth. Some of the depths and likely constitution of successive spheres are based on the results of [[geoseismology]]

(contracted; show full)al properties are temperature-dependent, so the geotherm must also be determined. This requires physical theory for thermal conduction and convection and the heat contribution of [radionuclides] radioactive elements. The main model for the radial structure of the interior of the Earth is the Preliminary Reference Earth Model (PREM). Some parts of this model have been updated by recent findings in mineral physics (see post-perovskite) and supplemented by seismic tomography."<ref name=Geophysics/>
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==Crusts==
{{main|Earth/Crusts|Crusts}}
[[Image:San Andreas.jpg|thumb|right|200px|The image shows a portion of the San Andreas Fault in California USA on Earth. Credit: Robert E. Wallace, USGS.]]
Using [[airborne astronomy]], the image on the right shows a portion of the San Andreas Fault in California USA.
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(contracted; show full)[[Category:Astronomy/Lectures]]
[[Category:Astronomy learning projects]]
[[Category:Earth]]
[[Category:Planetary science]]
[[Category:Resources last modified in April 2016]]
{{article}}{{lecture}}{{astronomy}}

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