Message #219685

[Qoais]

but just one look at the lunar crater rays will show that ejecta can be thrown many times the diameter of the original crater,

This would be expected on the moon because there is no gravity to force the ejecta back to ground.

The whole point was, that if something hit the earth causing a wave of water to end up in outer space, that something would also be large enough to destroy the planet. The force necessary to cause the water to raise that high, well, there wouldn't be an earth for  the water to fall back onto.  Look how much energy it takes just to launch a rocket and get it away from the earth's gravity.  Something that would be so powerful as to launch water into outer space, wouldn't leave a whole lot behind, never mind the water evaporating!! 

Current plate boundary conditions show that the plates are all moving apart except for the Pacific plate and the Australian and N. American Plates.  There is no indication that the African plate is "swinging" - in other words, as you've explained, the top is going one way while the bottom is going the opposite direction. 

I'm glad you found the links useful. 
http://en.wikipedia.org/wiki/File:Plates_tect2_en.svg