Noah was told to go inside the Ark along with his wife, three sons and their three wives. All the animals had been told to go to him (he did not have to go out and collect them). The Lord shut the door. Then they waited. Seven long days later the Great Flood began. Noah tells us (Genesis 7 & 8) that all the volcanoes were erupting, it began raining, and that the waters were rising for 150 days. The crust and oceans were convulsing and the whole Earth was covered. It was a flood like none other in Earth history.
What catalyzed the Great Flood? Rain did not produce it. Recall that it was only raining for 40 days and 40 nights. But the waters were rising for 150 days (Genesis 7:29). The volcanoes were erupting, but they do not appear to have been the cause either. Is it possible that Noah was on the opposite side of the Earth from a massive cometary bombardment?
Clouds can be seeded to produce rain. Dry ice is one catalyst causing rain. Could a significant number of hard frozen comets streaming in from deep space: one, begin to collapse the pre-Flood cloud cover with ensuing torrential rains; and two, slam into the Earth with concussions that could set off volcanoes; and three, then catalyze the volcanoes (the fountains of the great deep, erupting steam) to release high-pressure deep waters up to the surface? Maybe Noah did not see the comets themselves. And of course, if true, the evidence would later melt and become part of the post-Flood world's oceans. (We know that world ocean levels are about 300 feet (100m) higher than their pre-Flood levels.)
I wonder what the composition of the ice balls were, if the Hovind Theory (Dr. Kent Hovind's DVD Seminar #6) is correct. I wonder what was the angle and speed they hit the Earth, or rather - hit the upper atmosphere. Did they fragment? Were they more like comets, with dust and ice together?
Meteorites have lots of iron and nickel. They come in full speed, they are heavy, become hot, and they hit hard (if they survive the atmosphere).
Comets are different, as a giant icy snowball is not the same as a big rock flying through the air. They would probably be less cohesive, break up faster when heated, but transfer just as much energy to the atmosphere on the way in.
And it is possible, in theory, that the same astral event that wholloped Mars one day also hit the Earth. Sometime sit down with a cup of coffee or tea and look at the detailed images of the surface of Mars. If you are looking objectively and honestly you will notice something interesting. Almost all the craters are on one side! Don't believe the diehard evolutionists with their belief in "once every couple million years" a meteorite hit stuff. No, look at the evidence. Since Mars' orbit is also about 24 hours long, with all the craters on one side, and not on the other side of the planet, the evidence suggests a bombardment that hit - all in less than one hour. If Mars got hit in that way, and the Earth was in the same astral neighborhood, couldn't the Earth have gotten pummeled that way too? Maybe the Lord has left us evidence of the cometary bombardment of Earth, on the surface of Mars?
How about this article from the Univ. of Iowa: http://smallcomets.physics.uiowa.edu/
(By the way, ice can be retained in the upper atmosphere: http://www.agu.org/pubs/crossref/2003/2003JA009936.shtml