 What could be meant by the Schwartzberg quote in the passage saying that, "It looks like sand dancing in a child's sieve."?
Only Joseph Schwartzberg, head geographer of the Department of the Interior, wondered if the disturbance might not be a settling of the Kiowa Fault. The idea was not nearly so exciting as a volcano, even a lava-less one, and you couldn't draw a very dramatic picture of it. East, where sharp reports and muffled wheezes told of continued buckling and dropping, the earth trembled downward. "It looks like sand dancing in a child's sieve," said the normally impassive Schwartzberg in a nationwide broadcast from the scene of disaster. On the actual scene of the disaster (or the scenes ; it is impossible to speak of anything this size in the singular) there was a horrifying confusion.
 The swirling dust and rocks were churning substantially.
 The rocks and dust were quickly mixing with water and creating mud.  The rocks and dust were disappearing.  The swirling dust and rocks were churning substantially.  He was comparing the dust and rocks to a child by their minimal presence.