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- Earth (30908 bytes)
4: ...in here. It's been done to death. Find a gem with which to improve the article and you'll shine forev...
7: ...e Earth''' or '''Terra''', is the third planet outward from the [[Sun]]. It is the largest of the [[s...
14: ... sea level). Thus the Earth is an oblate spheroid within a [[tolerance (engineering)|tolerance]] of o...
17: ...inner core. The liquid outer core gives rise to a weak [[magnetosphere|magnetic field]] due to the co...
19: ... old [http://spaceflightnow.com/news/n0101/14earthwater/]. - Volcano (27295 bytes)
2: ... of the [[plate tectonics|continental plates]]. However, important exceptions exist in '''[[hotspot (...
10: ... (not very fluid) and is pushed up in a blob that will solidify relatively quickly. [[Lassen Peak]] i...
12: ...ht to be a little misleading, however, and are slowly falling into disuse.
15: ...lanet)|Mars]], and the tallest mountain in the known solar system.
18: ...r [[cinder cone]]s result from eruptions that throw out mostly small pieces of rock that build up aro... - Desert (21206 bytes)
4: ...'s deserts, http://pubs.usgs.gov/gip/deserts/what/world.html)
6: ... lands may be [[salt]]-covered flats. [[Eolian]] (wind-driven) processes are major factors in shaping...
8: ... that were formed in the arid environment or that were exposed by erosion. Because deserts are dry, t...
10: ...te classification]] system, they are classed as (BW).
14: ...arid lands have a mean annual precipitation of between 250 and 500 millimeters. Arid and extremely ar... - Comet (30542 bytes)
1: ...ge.jpg|thumb|250px|[[Comet Hale-Bopp]], showing a white dust tail and blue gas tail (February 1997)]]
3: ...zen [[carbon dioxide]], [[methane]] and [[water]] with [[dust]] and various [[mineral]] aggregates mi...
5: ...nate via a different process, but very old comets which have lost all their [[volatile]] materials ma...
9: ...c field lines rather than an orbital trajectory. While the solid body of the comet (called the ''nuc...
11: ...nce of Halley's Comet on the [[Bayeux Tapestry]], which records the [[Norman conquest]] of [[England]... - Agriculture (19147 bytes)
3: ...ce of agriculture is also known as '''farming''', while scientists, inventors and others devoted to i...
5: ...her, yet it only accounts for four percent of the world's [[gross domestic product|GDP]].<!--Source?-...
7: == Overview ==
11: ...developed" nations and increasingly so elsewhere, which consists of obtaining financial income from t...
13: ...he practice of agriculture—more formally known as [[agricultural science]]. - Cirrus cloud (3505 bytes)
3: [[Image:Sky-filled-with-cirrus-clouds.jpg|thumb|250px|Cirrus clouds]]
4: [[Image:Cirrus-clouds-photo.jpg|thumb|250px|Wispy Cirrus clouds centre of image]]
7: '''Cirrus''' ([[Latin|Lat.]] 'wisp of hair') is a type of [[cloud]].
9: ...irrus clouds in the sky it may be a sign that a [[Weather front|frontal system]] is approaching. Cirr...
11: ...re composed of ammonia or methane ice rather than water ice. The term cirrus is also used for certain... - Mars (27704 bytes)
1: [[Image:Mars.jpg|thumb|right|Mars, with polar ice caps visible.]]
2: ...IA00161 modest.jpg|thumb|right|North Polar region with icecap. (Courtesy NASA/JPL-Caltech.)]]
4: ...bos (moon)|Phobos]] and [[Deimos (moon)|Deimos]]) which are both small and oddly-shaped, possibly bei...
6: Its symbol, ♂ (a circle with a small arrow pointing out from behind it), is a stylized repre...
8: Mars has always fascinated people. Its red, fiery appearance i... - Jupiter (24639 bytes)
1: ...ollapse: collapse; font-size: 95%;" align="right" width=280px
4: ...Click for full caption.]]<br/><small><font color="white">Click image for description</font></small>
53: ... E8 m|142,984 km]] [http://www.onasch.de/astro/showobject.php?lang=en&obj=p05]<br>(11.209 Earths)
80: | 0.413 538 021 d (9 h 55 min 29.685 s) [http://www.hnsky.org/iau-iag.htm <sup>1</sup>]
119: | [[Methane]] - Saturn (planet) (23300 bytes)
1: ...="margin:0 0 .5em 1em; border-collapse:collapse;" width=280px;
4: ...250px|The planet Saturn]]<br> <small><font color="white">Click image for description</font></small>
53: ... E8 m|120,536 km]] [http://www.onasch.de/astro/showobject.php?lang=en&head=f&anim=129&obj=p06]<br>(9....
71: | 0.6873 g/cm<sup>3</sup><br/> (less than [[water]])
80: ... 259 2 d<br/> (10 h 39 min 22.400 00 s) [http://www.hnsky.org/iau-iag.htm <sup>1</sup>] - Uranus (15207 bytes)
1: ...: collapse; font-size: 95%;" style="float:right;" width=280px
5: <small><font color="white">Click image for description</font></small>
10: | [[William Herschel]]
89: ...718 333 333 d (17 h 14 min 24.000 00 s) [http://www.hnsky.org/iau-iag.htm <sup>1</sup>]
130: | [[Methane]] - Neptune (planet) (18545 bytes)
1: ... align="right" style="width:280px; float: right;" width=280px
4: ...x|Neptune from Voyager 2]]<br><small><font color="white">Click image for description</font></small>
61: ...1 E7 m|49,528]] km [http://www.onasch.de/astro/showobject.php?lang=en&head=f&anim=129&obj=p08]<br>(3....
88: | 16.11 h (16 h 6 min 36 s) [http://www.hnsky.org/iau-iag.htm <sup>1</sup>]
127: | [[Methane]] - CH<sub>4</sub> - Pluto (planet) (26470 bytes)
1: ... collapse; font-size: 95%;" style="float: right;" width=280px
5: <br/><small><font color="white">'''Brightness map of Pluto'''</font></small>
10: | [[Clyde Tombaugh|Clyde W. Tombaugh]]
89: ...)<br/>115.60? (to the [[ecliptic]])<sup>[http://www.hnsky.org/iau-iag.htm]</sup>
91: ...ght ascension]]<br>of North pole<!--- Pole around which direct rotation occurs ---> - Alternative technology (2518 bytes)
1: ...ch as greater efficiency, or different fuels or power sources.
3: ...econdary materials, or that reduce or eliminate [[waste]] or [[emission]]s at the source of generatio...
5: ...h should be done and how it should be funded; and which of a field of competing alternative technolog...
7: ...ternative." For example, a class of chemicals known as [[CFC]]s have been replaced by more ozone-fri...
10: * [[Wind generator]]s - Earthquake (13859 bytes)
1: ...e) the boundaries of the [[tectonic plates]] into which the Earth's [[lithosphere]] is divided. Even...
5: ... the earthquakes shaking is the dominant and most widespread cause of damage.
9: ...989.jpg|thumb|200px|none|Section of collapsed freeway after the 1989 [[Loma Prieta earthquake]].]]
11: ...ove it is the "[[epicenter]]". The fault may slip well beyond its epicenter, though. Just as a large...
15: ...he surface waves ([[Love waves]]) then [[Rayleigh waves]]. - Earth's atmosphere (10093 bytes)
1: ...[radiation]] and reducing temperature extremes between [[day]] and [[night]].
5: ...2 mi), is also frequently used as the boundary between atmosphere and space.
8: ...ship]] between temperature and altitude varies between the different atmospheric layers:
10: ...itude and weather factors, temperature decreasing with height.
11: ...7 km range to about 50 km, temperature increasing with height. - Ice age (15810 bytes)
4: ...eriods during ice ages and 'interglacial' for the warmer periods.
6: During the last few million years there have been many glacial period...
10: ...ia.edu/aberjame/histgeol/agassiz/glacial.htm]. Between 1825 and 1833 [[Jean de Charpentier]] assemble...
12: ...ing the current ice age. The far earlier ice ages were unsuspected.
16: ...ccurred from 460 to 430 million years ago. There was an extensive ice age from 350 to 260 million ye... - Intestine (1989 bytes)
2: ... into the [[duodenum]], [[jejunum]] and [[ileum]] while the large intestine is subdivided into the [[...
4: ...d molecules into [[nutrients]], the intestine allows these nutrients to enter the blood via its dedic...
6: ...for diffusion of nutrients through the intestinal wall so they can be absorbed. These microscopic fol...
8: ...ur intestine (which is released as ''flatulence'' when removed through the anus).
15: ...ase if left untreated; most cases of appendicitis will require surgical intervention. - Climate change (15859 bytes)
1: ...of climate, including precipitation and clouds as well as temperature. Climate changes can be caused ...
3: ...used change [http://www.grida.no/climate/ipcc_tar/wg1/518.htm]. Sometimes the term "anthropogenic cli...
5: ...ttribution of recent climate change]]. For global warming episodes in the geological record, see [[Pe...
8: ...'. Internal factors are those due to interactions within the earth's climate system. External factors...
12: ...glacial were probably caused by events associated with the [[Canadian Shield|Laurentide]] ice sheet a... - Global warming (53726 bytes)
3: ...n dioxide]] (CO<sub>2</sub>). The alternative view, that the principal causes are natural cycles suc...
5: ...over the next one hundred years due to the lag in warming caused by the oceans.
7: ...effects by causing [[flood]]s, [[drought]]s, heat waves, reduction of [[agricultural]] yields or in e...
11: ...used change [http://www.grida.no/climate/ipcc_tar/wg1/518.htm]. Sometimes the term "anthropogenic cl...
16: ...ed Kingdom]] and the [[United States]] [http://www.royalsoc.ac.uk/displaypagedoc.asp?id=13057]. - Moon (37975 bytes)
7: <small><font color="white">The Moon as seen from Earth</font></small>
42: ...5.145 396? to [[ecliptic]])<br />[[#Orbit|see below]]
56: | 3,476.2 km [http://www.onasch.de/astro/showobject.php?lang=en&head=f&anim=129&obj=p03m01]<br ...
89: | varies between<br />3.60? and 6.69?<br />(1.5424? to ecliptic...
185: | [[Methane]]<br />
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