On a Torn-Away World by Roy Rockwood, Fiction, Fantasy & Magic 14+

📕 WHAT A RIDE!"You mean, sir, that the earthquake and the volcanic eruption have torn away some great fragment of the world, and we are on it?""That is what I mean.""We are floating in space, then -- an entirely new world? And that is the old world shining there in the sky?""That is what has happened, Jack," declared Professor Henderson.Teenagers Jack Darrow and Mark Sampson have been on some thrilling adventures with Professor Henderson, but this beats all!The Professor has just built a fabulous speedy new airship called The Snowbird. He, the lads, Washington White and his irascible Shanghai rooster, take a spin to find a rare plants native only to Alaska. A series of dreadful earthquakes, though, tears a hunk of Alaska off the Earth, spinning it up into the stratosphere, our heroes on it?