Some volcanoes slowly ooze magma while others explode with immense power. Yet all volcanic eruptions begin in the magma chamber. Meet a scientist who has created a model chamber in his lab.

Journey thousands of meters below sea level to examine the underwater geysers that spew hot, mineral-rich water from beneath the seafloor ... and that are host to an amazing diversity of life.

Give your notes and musings added weight with these rock-solid designs. Add your name and address—and anything else you want to say—to these colorful stationery files.

From slow creeping continents to ground-splitting quakes, the Earth is constantly changing. Take a peek at our planet's layers, learn what secrets rocks reveal, and gain a long view of history.

Jade has been used by people around the world for thousands of years—first to make tools, later to create precious works of art. Take a peek into mineralogist George Harlow's scrapbook to see why he thinks this rock is so special.

A volcanic eruption that could be felt across an ocean, an earthquake that sparked landslides, massive tsunamis, and a volcanic eruption ... Examine the world-changing results of plates on the move.

Mundo Shamundo! With the help of these magic words, the Amazing Mundo can literally reverse the sands of time. Watch him transform worldly objects ... back into rocks in this fun comic strip.