"Don't you dare leave this boat!" commanded Betty, a bit sternly.
"Why not?" asked Mollie, curiously.
"I'll tell you why. Though the cake we are on seems solid, there may be cracks in it, and it might separate if we stepped out on it. You see our weight would come in a comparatively small space, whereas in the boat it is distributed over a large surface."
"My? Where did you learn that?" asked Mollie, admiringly.
"In our physics class. It's true, too. We must stay here."
"How, long?" queried Grace. "It will soon be late, and——"
"You have some chocolates; haven't you?" demanded Betty, quickly.
"Yes, but——"
"Then save them. We may be here for some time, but we are bound to be taken off—sooner or later."
"And if it's later, and the cake of ice goes to pieces, no matter whether we get out on it or not, what will happen?" Amy wanted to know.