That's because the higher speed of comets and the high volatility of their constituents would
create giant plumes on impact, so more of the iridium would escape into space, compared with impacts by rocky asteroids.
Not exact matches
A clue came from local residents who told researchers that the die - off coincided with a «red tide» of harmful algal and a
giant plume of smoke
created by massive fires hundreds of kilometers away.
The proximity of these ULVZs below volcanic island chains has prompted theories suggesting that the
giant reservoirs of molten rock feed the mantle
plumes that
create the islands on Earth's surface.