Volcanoes
When Mount Vesuvius blew up in A.D. 79 ash cinders and stones buried agreat city below the mountain. Volcanoes are dramatic and powerful. Thereare thousands... »

Down Comes the Rain
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Sunshine Makes the Seasons
Sunshine Makes the Seasons »

Gravity Is a Mystery
What goes up must come down. Everybody knows that. But what is it thatpulls everything from rocks to rockets toward the center of the earth? Itsgravity. Nob... »

Earthquakes
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Is There Life in Outer Space
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What Makes a Magnet?
Will a magnet pick up a paper clip or a feather? In this book veteran authorFranklyn Branley explains the properties and behavior of magnets. The charmingill... »

Tornado Alert
Stage 2 »

Air Is All Around You
Air Is All Around You »

Flash, Crash, Rumble, and Roll
Did you know that lightning bolts can be over a mile long? Or that they maycome from clouds that are ten miles high? Storms can be scary but not if youknow w... »