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| | Intercontinental ballistic missile (Site not responding. Last check: 2007-10-22) |
 | | An intercontinental ballistic missile, or ICBM, is a long-range ballistic missile using a ballistic trajectory involving a significant ascent and descent, including sub-orbital flight. |
 | | An ICBM differs little technically from other ballistic missiles such as intermediate-range ballistic missiles, short-range ballistic missiles, or the newly named theater ballistic missiles; these are differentiated only by maximum range. |
 | | ICBMs are based either in missile silos, which offer some protection from military attack (including, the designers hope, some protection from a nuclear first strike), or on submarines, rail cars or heavy trucks, which are mobile and therefore hard to find. |
| www.arikah.net /encyclopedia/Inter-continental_ballistic_missile (1363 words) |
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