Difference between revisions 1834770 and 1863059 on enwikiversity

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Earth
[[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 a 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.]]
(contracted; show full)flow at the surface, and [[mineral physics]] is combined with the Earth's mass and moment of inertia to infer models of the Earth's interior - its composition, density, temperature, pressure. For example, the Earth's mean specific gravity (5.515) is far higher than the typical specific gravity of rocks at the surface (2.7&ndash;3.3), implying that the deeper material is denser. This is also implied by its low moment of inertia (0.33 ''M'' ''R''<
/var><sup>2</sup>, compared to 0.4 ''M'' ''R''</var><sup>2</sup> for a sphere of constant density). However, some of the density increase is compression under the enormous pressures inside the Earth. The effect of pressure can be calculated using the Adams–Williamson equation. The conclusion is that pressure alone cannot account for the increase in density.

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'''Def.''' "a line drawn through geographical points recording equal amounts of precipitation during a specific period"<ref name=Beitler/> is called an '''isohyet'''.

'''Def.''' a "mountain glacier that terminates in the ocean"<ref name=Beitler/> is called a '''tidewater glacier
"'''.
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==Asteroids==
{{main|Rocks/Rocky objects/Asteroids|Asteroids}}
[[Image:2008VK184-year2014.png|thumb|right|200px|The close approach of apollo asteroid 2007 VK184 was in May 2014. Credit: Osamu Ajiki (AstroArts) and Ron Baalke (JPL).]]
[[Image:2007vk184a.jpg|thumb|right|200px|Asteroid 2007 VK184 has been eliminated as Impact Risk to Earth. Credit: Steven Chesley.]]
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[[Category:Astronomy/Lectures]]
[[Category:Astronomy learning projects/Lectures]]
[[Category:Earth/Lectures]]
[[Category:Planetary sciences/Lectures]]
[[Category:Resources last modified in January 2018]]
[[Category:Astronomical objects/Lectures]]