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Old 27 Mar 17, 13:01
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Here's something I came across years ago which might be an interesting factor, if not a major cause of the collapse;
Comets and the Bronze Age Collapse

by Bob Kobres

EXCERPT:
...
During a close approach to a massive object like our planet a comet would be gravitationally disrupted (Phaethon's disentegrating chariot) independent fragments would then further break to pieces as they entered Earth's atmosphere. This debris, of various shapes and sizes, would scatter widely along the path of the fall, each piece harboring energy in proportion to its mass. The "footprint" of this event could have included some of: southern Europe, the Mediterranean, the Near East, and Northern Africa. Damage, however, would not be uniform throughout this area. If the disintegrating objects were traveling south of east, as the Phaethon story implies, the more massive fragments would travel farther and release their greater energy, explosively, lower in the atmosphere toward the southeast end of the elliptical area directly affected by the fall. In other words, the Near East would be more heavily damaged than southern Europe. A survey scaling intensity of site destruction might reflect this aspect, i.e., vitrification of soil and building materials might occur below lower altitude multi-megaton blasts.

Secondary effects of a large impact event would include: a spottily enhanced C-14 environment, making this means of dating unreliable to confirm or refute simultaneous destruction of disparate sites; a large production of oxides of nitrogen yielding dangerous ozone depletion, perhaps giving a survival advantage to darker skinned people in the aftermath, particularly in equatorial regions; acidic precipitation from the above-mentioned atmospheric chemistry; and, in the higher latitudes, impact winter, caused by suspended dust and soot.

All of these phenomena would leave evidence which careful field work could reveal. Some indicators may already be evident, such as the abandonment of many long settled sites, a large southward movement of people from the higher latitudes, and a steep, long-term (1159-1140 B.C.) decline in the annual growth of Irish bog oak that stands out in the 7,272 year long dendrochronological record, based on this species of tree. [Baillie and Munro (1988)]

...
http://abob.libs.uga.edu/bobk/bronze.html
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