Volcanic Maar
Volcano Terms and Definition

Savage Earth

Waves of Destruction
Out of the Inferno
Restless Planet
Hell's Crust
From the legendary fury of Mt. Vesuvius to the devastating convulsions of Kobe, Japan, Savage Earth tells the stories of these great natural disasters, the scientists who struggle to understand and predict them, and the people whose lives are forever changed by their merciless force


A maar is a low-relief, broad volcanic crater formed by shallow explosive eruptions. The explosions are usually caused by the heating and boiling of groundwater when magma invades the groundwater table. Maars often fill with water to form a lake.

Top photo: Aerial view toward N of Ukinrek Maars, Alaska; Lake Becharof at top of photo. Water partially fills the eastern maar and completely covers a lava dome that was erupted in the 100-m deep crater during a 10-day eruption in 1977. Maar is about 300 m in diameter.

Bottom photo: Eruption column generated by phreatic and magmatic explosions rises from the larger east maar.

Ring of Fire - IMAX
The Closest You'll Ever Get to a Volcano Originally filmed in IMAX Ring of Fire takes you heart stopping close to the great circle of volcanoes and seismic activity that rings the Pacific Ocean. The story of these immense volcanic forces and the half a billion people that coexist with them every day around the fiery boundary of the Pacific Rim


Leapfrog Learning Systems

  • Handheld computerized learning system
  • Learn to write letters on the L-Max handheld screen - the letters you write will appear on the TV and star in an animated story!
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  • Works with the full Leapster and Leapster L-Max software library
  • Stories suddenly come to life with the light tap of the Magic Pen
  • The award-winning LeapPad Learning System teaches fundamental reading skills in a way that keeps your child coming back again and again
  • The LeapPad Learning System uses a larger platform and thinner pen designed for preschoolers and kindergartners to introduce them to the magic of books and reading
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Learning Resources Gears! Gears! Gears! Oogly Googly

Includes motor and hand control (with forward/reverse switch), gears, springs, connecting blocks, two claws, and three eyeballs. Starting with the motor pack, add the pieces together according to the instructions or follow your own mad scientist ideas to create endless mayhem. Can be used alone or with other Gears! Gears! Gears! sets.

Learning Resources Gears! Gears! Gears!

Great toy to help open up the world of "how things work" for younger kids. Inspires imaginative play, problem solving, and cause & effect thought processes. Gear up for hours of colorful action with Gears! Gears! Gears! enables children to create hundreds of three-dimensional construction possibilities. Set features plastic gears, connectors and interlocking bases packaged in a giant storage tub with an Activity Guides.

Gears! Gears! Gears! Boogie Buddy Motorized Sets

Challenge kids' mechanical reasoning skills while encouraging creativity and gross motor coordination through building and movement. Color-coding makes it easy for children to follow building instructions for three different models. They can also create their own model. Compatible with all other Gears! Gears! Gears! Sets, sold separately.


Volcano Glossary

U.S. Department of the Interior