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But what do you think the N.A. legends mean by the earth cracking open, and springs flowing forth. I’m trying to figure out if a terrestrial impact would some how cause the internal pressure to increase within the earth interior, causing it to burst, so to speak...or maybe just the impact (s) directly caused the bursting, of sorts.
...just brainstorming...
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And responding to said brainstorming, the preHispanic Nahua believed mountains were somehow full of water, a conceit possibly fuelled by observation of mountain springs. This is covered in Tamoanchan, Tlalocan - Places of Mist by Alfredo Lopez-Austin (University Press of Colorado) and Eating Landscape - Aztec and European Occupation of Tlalocan by Philip P. Arnold (also University Press of Colorado) which quotes Sahagun's Florentine Codex (book 11, page 247) thus:
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And they [the Aztecs] said that the mountains were only magic places, with earth, with rock on the surface; that they were only like ollas (or vessels) or like houses; that they were filled with the water which was there. If sometime it were necessary, the mountains would dissolve; the whole world would flood.
Given that this idea was not restricted to the Nahua, but variations appear in other cultures (Lopez-Austin cites the Huichol) possibly even those of Peru (Arnold page 122 note 35 - although I need a bit more detail to confirm this) it might not be so inconceivable that the idea of mountains-as-water-stores was widespread (in one form or another) throughout the Americas, as is true of trickster archetype figures and the general attitude to sacrifice/pain etc. So perhaps the image of the earth cracking open is an attempted explanation of real events rather than a literal record of something observed.
Interesting hypothesis. Especially since the belief was held by various cultures.
http://en.wikipedia.org/wiki/Ogallala_Aquifer
The water-permeated thickness of the Ogallala Formation ranges from a few feet to more than 525 feet (160 m) and is generally greater in the northern plains. The depth of the water below the surface of the land ranges from almost 400 feet (122 m) in parts of the north to between 100 to 200 feet (30 to 61 m) throughout much of the south. Present-day recharge of the aquifer with fresh water occurs at a slow rate; this implies that much of the water in its pore spaces is paleowater, dating back to the last ice age.
Would explain the springs popping up and the moutains full of water.