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  1. Cartography (10500 bytes)
    3: ...trends in this field are moving away from analog methods of mapmaking and toward the creation of incre...
    9: ...]. The [[Ancient Egypt|Egypt]]ians later used geometry to survey land and to resurvey it after the per...
    11: ... a disk supported by water. [[Anaximander]] of Miletus theorized at about the same time that the earth...
    19: ...ed the science of [[map projection]]s, which are methods of representing the curved surface of the ear...
    21: ...ic as well, since cadastral needs generally were met by descriptions of landmarks rather than by measu...
  2. Igneous rock (11419 bytes)
    6: ...er parts of the mantle at temperatures estimated between 600 to 1600 °C.
    8: ... [[silicate minerals]], which account for over ninety percent of all igneous rocks.
    10: ...ely thin but widespread layer of sedimentary and metamorphic rocks.
    15: ...ges can be obtained from various forms of [[radiometric dating]] and thus can be compared to adjacent ...
    20: ...rence, texture, chemical composition, and the geometry of the igneous body.
  3. Earth (30908 bytes)
    1: {{Planet Infobox/Earth}}
    7: ...science]] confirms as harboring [[life]]. The planet [[Age of the Earth|formed]] around 4.57 [[billion...
    14: ...htly [[oblate]] [[spheroid]], with an average diameter of approximately 12,742 km. The maximum deviati...
    17: ...ter core gives rise to a weak [[magnetosphere|magnetic field]] due to the convection of its electrical...
    55: ...rnal heat was originally generated during its accretion (see [[gravitational binding energy]]), and si...
  4. Volcano (27295 bytes)
    2: ... very active) on the [[solar system]]'s rocky planets and moons, on [[Earth]] at least, this phenomeno...
    12: ...te that the terms ''felsic'' and ''mafic'' are sometimes substituted by the older chemistry terms "aci...
    15: ...Olympus Mons]] is a shield volcano on [[Mars (planet)|Mars]], and the tallest mountain in the known so...
    24: ...es are usually situated either at the boundaries between [[tectonic plates]] or over [[hot spot]]s. Vo...
    41: ...veral million years, making such a distinction sometimes meaningless when compared to the lifespans of...
  5. Geography of the United States (15104 bytes)
    80: exist, though each is composed of yet small physiographic subdivisions.
    88: ...he Rocky and Pacific Mountain Systems. It is the setting for the [[Grand Canyon]], the [[Great Basin]]...
    104: ...ntain System and the Pacific Mountain System. In between these, lie the Intermontaine Plateaus. Heavy ...
    109: ...e Interior Plains and the Interior Highlands lie between the two
    110: coasts, stretching from the [[Gulf of Mexico]] northward, far b...
  6. Earthquake (13859 bytes)
    5: ...truction]] and massive loss of life through a variety of agents of damage, including fault rupture, vi...
    9: ...ion of collapsed freeway after the 1989 [[Loma Prieta earthquake]].]]
    11: ...ge earthquakes, it can spread over the entire planet. Ground motions caused by very distant earthquake...
    20: ...quakes measures horizontal movement. The press sometimes mistakenly reports such values as "Richter ma...
    22: ... recorded by the [[Pacific Northwest Seismograph Network]] that shows the instrument recorded [[intens...
  7. Tsunami (29462 bytes)
    2: ...andslide]]s, [[volcanic eruption]]s and large [[meteorite impact]]s all have the potential to generat...
    4: ... very long [[wavelength]] (often hundreds of kilometres long), which is why they generally pass unnoti...
    10: ...[volcano|volcanic eruption]], [[landslide]] or [[meteorite impact]]. However, the most common cause is...
    14: Sub-marine landslides; which are sometimes triggered by large earthquakes; as well as co...
    21: ...ushika Hokusai|Hokusai]]). In fact, a tsunami is better understood as a new and suddenly higher sea le...
  8. Blimp (3839 bytes)
    1: ... [[helium]]) inside the envelope. For a more complete description of this style of [[aircraft]], pleas...
    7: ...]], a year before the first B-class airship."'' ("Etymology of 'Blimp'" by Dr. A. D. Topping, ''AAHS J...
    9: ...his erroneous explanation is an example of [[fake etymology]].
    13: ...ir instead of a light gas as lifting medium is sometimes called a hotship.
    16: ...f [[Goodyear Tire and Rubber Company]]'s blimp fleet.]]
  9. Yellowstone National Park (23738 bytes)
    25: ...perate zone]] [[ecosystems]] remaining on the planet.
    27: ...ount St. Helens]] in 1980 and left a huge 70 kilometer long, 30 km wide [[caldera]] sitting over a hug...
    34: ...dicate that a regular [[obsidian trade]] existed between Yellowstone Native Americans and tribes furth...
    39: ...dger was known for being a "spinner of yarns." Nonetheless his stories did arouse the interest of expl...
    42: ...me known as "National Park" Langford and an Army detachment commanded by Lt. [[Gustavus Doane]]. The e...
  10. Kite flying (5612 bytes)
    6: ...ng strings are abrasive and able to sever the competitor's kites. Such practice is dangerous since the...
    11: ...lk for the sails. Modern kites are made with synthetic materials: nylon or more exotic fabrics for the...
    13: ...t shapes, forms and sizes, from historic flat geometric designs, through box kites and other aerodynam...
    15: ... like an octopus and squid and are more than 40 feet long.]]
    16: ...s.jpg|thumb|200px|left|These kites are about 50 feet long each. The rainbow color wind sock near the b...
  11. Walrus (6653 bytes)
    20: ==Etymology==
    22: ...omes from the Dutch ''walrus'', apparently a folk-etymology inversion from an Old Norse form resemblin...
    28: ...rm a large part of their diet. Male walruses compete for territory, often fighting each other; the wi...
    30: ...the north shore of [[Alaska]], and in the waters between those locations.
    36: ...he females who view them from pack ice. Males compete with each other aggressively for this display-sp...
  12. Monarch butterfly (5180 bytes)
    19: ...eeks as a butterfly). How the species manages to return to the same overwintering spots over a gap of ...
    23: ...f form called complete [[metamorphosis (biology)|metamorphosis]]. This process goes through four radic...
    25: ...ing itself encased in an articulated green exoskeleton. At this point, hormonal changes occur, leading...
    40: ....usgs.gov/resource/distr/lepid/bflyusa/usa/92.htm USGS description of Monarch butterfly]
    41: *[http://fohn.net/monarch-butterfly-pictures/ Monarch butterfly pic...
  13. Death Valley National Park (38245 bytes)
    1: ...he [[Death Valley Pupfish]] - a survivor of much wetter times.
    3: ...ey, helping to make it famous and the subject or set of numerous [[book]]s, [[radio]] programs, [[tele...
    5: ...ay. Valleys filled with sediment and, during the wet times of [[ice age]]s, with [[lake]]s, such as [[...
    7: ==Geographic setting==
    38: ...flash flood]]s which remodel the landscape and sometimes create ephemeral very shallow lakes.
  14. Landslide (2693 bytes)
    12: ...th ice, but are generally much slower moving. Nonetheless, they can generate forces strong enough to ...
    30: * ''First-draft text taken from USGS fact sheet, public domain''
    33: * [http://landslides.usgs.gov/ United States Geological Survey site]
    35: ...lash.html Slide!], a program on B.C.'s Knowledge Network, with video clips
  15. Gallium (9500 bytes)
    21: | [[poor metal]]s
    27: | 5904 [[kilogram per cubic metre|kg/m<sup>3</sup>]], 1.5
    40: | 130 (136)[[picometre|pm]]
    72: ...ntific notation|&times;]]10<sup>-6</sup> [[cubic metre per mole|m<sup>3</sup>/mol]]
    84: | 2740 [[metre per second|m/s]] at 20&nbsp;?C
  16. Helium (36603 bytes)
    44: | 0.152 [[watt|W]]/([[metre|m]]&middot;[[kelvin|K]])
    72: | 32 [[picometre|pm]]
    75: | 140 [[picometre|pm]]
    104: ...]. The behavior of [[liquid helium]]-4's two varieties&mdash;helium I and helium II&mdash;is importan...
    108: ... breathing systems, to cool [[superconducting magnet]]s, in [[helium dating]], for inflating [[balloon...
  17. Lithium (11359 bytes)
    19: | [[Alkali metal]]
    25: | 535 [[kilogram per cubic metre|kg/m<sup>3</sup>]], 0.6
    39: | 134 [[picometre|pm]]
    59: | solid ([[magnetism|nonmagnetic]])
    68: ...ntific notation|&times;]]10<sup>-6</sup> [[cubic metre per mole|m<sup>3</sup>/mol]]
  18. Caldera (4953 bytes)
    2: [[Image:Crater Lake from rim-USGS.jpg|thumb|270px|Crater Lake|Crater Lake, Oregon]]...
    5: ...ount of collapse may be hundreds or thousands of meters.
    8: ... erupt hundreds or even thousands of [[cubic kilometer]]s of material in a single event. Even small c...
    12: ... years ago, this volcano released 2800 cubic kilometers of ejecta. In the late 1990s, [[archeologist]]...

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