To: gleeaikin
"Regarding bay formations, could great chunks of ice have been blown all over the place causing gouges, and/or sitting and melting and forming pools which which would subsequently be modified by wind and frost?" I would guess no because of the heat.
62 posted on
06/04/2007 10:58:17 AM PDT by
blam
To: blam; gleeaikin
"...could great chunks of ice have been blown all over the place causing gouges..."
I wouldn't say no so quickly. Larger meteors (~ 10's of meters and up) have a large enough mass-to-surface-area ratio that the heat from entry does not get very far in. (Most of the heat is produced by ram effect (Charles' law) rather than friction.) The pressure that builds up on the side facing in the direction of travel usually breaks apart large meteors, which are often not stuck together that solidly to begin with. The superheated gas will of course penetrate any cracks or interstitial gaps between chunks, which helps the breakup. But, the interiors of the chunks can still be quite cold at impact. If some of the chunks of a large meteor were ice, they could still be mostly frozen up until impact.
This may have been the situation with Tunguska, which featured a large energy release but little rocky or metallic debris was ever found, and no significant crater. So it may have been mostly ice, and broke up just before impact.
76 posted on
06/04/2007 9:23:20 PM PDT by
omnivore
To: blam
“I would guess no because of the heat.”
Now that I have read “The Cycle of Cosmic Catstrophes”, I think they agree with my posted guess. Very large chunks of ice blown out of the glaciers by very large boloid.
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