8:30 A.M. The day promised to be beautiful. Sunday: May 18, 1980 8:32 A.M. The promise is broken. Mount St. Helens explodes! It was once thought the earth's crust was all in one piece - like the skin of an apple. Today, most scientists believe the crust is broken into pieces and that the continents we live on are drifting. This movement is so slow that we do not see it. But there are many signs of it, among them earthquakes and volcanic eruptions. Exploding volcanoes and tearing earthquakes are changing the face of our earth. New islands are born — old ones disappear — huge cracks open in the earth and new lakes appear. This exciting book explains what earth scientists know about volcanoes and earthquakes. It's better than science fiction — it's science fact!