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1. 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/].
2. 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...
3. 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...
4. 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]...
5. 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&mdash;more formally known as [[agricultural science]].
6. 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...
7. 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, &#x2642; (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...
8. 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 ¹]
   119: | [[Methane]]
9. 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/cm³<br/> (less than [[water]])
   80: ... 259 2 d<br/> (10 h 39 min 22.400 00 s) [http://www.hnsky.org/iau-iag.htm ¹]
10. 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 ¹]
    130: | [[Methane]]
11. 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 ¹]
    127: | [[Methane]] - CH₄
12. 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]])^{[http://www.hnsky.org/iau-iag.htm]}
    91: ...ght ascension]]<br>of North pole<!--- Pole around which direct rotation occurs --->
13. 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
14. 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]].
15. 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.
16. 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...
17. 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.
18. 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...
19. Global warming (53726 bytes)
    3: ...n dioxide]] (CO₂). 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].
20. 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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