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Extensible Markup Language  |  1995-08-14  |  7KB  |  29 lines

  1. <?xml version="1.0" encoding="utf-8" ?>
  2. <!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
  3. <card>
  4.     <id>10021</id>
  5.     <filler1>0</filler1>
  6.     <cantDelete> <false /> </cantDelete>
  7.     <showPict> <true /> </showPict>
  8.     <dontSearch> <false /> </dontSearch>
  9.     <owner>5472</owner>
  10.     <link rel="stylesheet" type="text/css" href="stylesheet_3106.css" />
  11.     <content>
  12.         <layer>background</layer>
  13.         <id>25</id>
  14.         <text><span class="style10">ining, Minerals and Metals (4 of 4)</span><span class="style7"></span><span class="style10">GEMS</span><span class="style7">Hundreds of stones are mined as gems. The most important is diamond (a form of carbon) because its great hardness makes it important for tools in industry. The major source of diamonds is South Africa, where they are recovered from rock by deep mining. Where gemstones have been eroded from rocks by water, they may be found in gravel deposits. Sapphires and rubies, for instance, occur in such deposits in Sri Lanka.</span><span class="style10">                                                     METALS  Element                                    Abundance                Major uses</span><span class="style7"> (mineral)                                                   </span><span class="style10">in crust</span><span class="style7">                                                                 (parts per                                                                   million) Aluminum                                                 81 000                           Conductors, aircraft, (bauxite)                                                                                          ships, cars, foil Chromium                                                  under                            Chromium-plating, (chromite)                                                   700                               stainless steel Copper                                                        100                              Conductors, (many)                                                                                             alloys (brass, bronze),                                                                                                          coinage, plumbing Gold                                                            under                            Source of value, (naturally                                                      0.005                            jewelry, some occurring)                                                                                          electronic uses Iron                                                               50 000                         Structures, machines Lead                                                              20                                Batteries, roofing, (galena)                                                                                             radiological protection Magnesium                                                    25 000                        Low-density alloys (magnesite,                                                                                       for aircraft, etc.)                                                                                                   machinery, etc. Mercury                                                          under                          Explosives, scientific (cinnabar)                                                        1                                 instruments, dentistry Nickel                                                              under                         Nickel-plating, steel (garnierite,                                                        80                              alloys, gas-turbine pentlandite)                                                                                         engines, coinage Platinum                                                            under                        Catalyst in chemical (naturally                                                           0.005                        processes and in car occurring,                                                                                           exhausts sperrylite) Silver                                                                 under                        Jewelry, silverware, (many)                                                               1                               photographic emulsions Tin                                                                     1.5                           Tin-plating, alloys (cassiterite)                                                                                         (bronze and pewter) Tungsten                                                            1.5                           Lamp filaments, (wolframite,                                                                                        electronics, steel scheelite)                                                                                             alloys, cutting tools Uranium                                                              under                       Nuclear power  (pitchblende)                                                       7                              stations  Zinc                                                                     under                      Alloys (brass), (sphalerite)                                                           80                           galvanizing steel</span><span class="style10">COAL</span><span class="style7">Coal is a carbon-based mineral that formed over many millions of years as a result of the gradual compacting of partially decomposed plant matter. Three basic types of coal are found: lignite, bituminous coal and anthracite. Lignite (brown coal) has the lowest heat value, since it was formed more recently and contains less carbon and more water than the other varieties. About half the coal mined is used for generating electricity, with another quarter going to the steel industry as coking coal. The remainder is used in other industries or for home heating. In the past, coal was the chief raw material for the plastics industry, but in this function it has been largely superseded by crude oil.</span></text>
  15.     </content>
  16.     <content>
  17.         <layer>background</layer>
  18.         <id>23</id>
  19.         <text>ΓÇó ELEMENTSΓÇó THE EARTH'S STRUCTUREΓÇó THE FORMATION OF ROCKSΓÇó ENERGY 1ΓÇó OIL AND GASΓÇó THE INDUSTRIAL REVOLUTION</text>
  20.     </content>
  21.     <content>
  22.         <layer>background</layer>
  23.         <id>36</id>
  24.         <text>427684304310420</text>
  25.     </content>
  26.     <name>p312-4</name>
  27.     <script></script>
  28. </card>
  29.