Page:Tom Swift and His Wireless Message.djvu/128

118 it was accompanied by a low, rumbling sound, like distant thunder. The adventurers were swaying to and fro.

Suddenly they were tossed to the ground by a swaying motion, and not far off a great crack opened in the earth. The roaring, rumbling sound increased in volume.

"An earthquake! Ifs an earthquake!" cried Tom. "We're in the midst of an earthquake!"