Fire Mountain: The Eruption and Rebirth of Mount St. Helens
Two hundred and thirty square miles leveled in moments Five hundred and forty million tons of ash and volcanic rock exploded twelve miles high One cubic mile of earth blasted from the crest of one of the world's most beautiful snowcapped domes Captured in rare and spectacular aerial photography and survivor's own words and pictures, witness the terrifying fury of the worst volcanic disaster in American history
NOVA - In the Path of a Killer Volcano
The scientists who remain behind- and see some astonishing footage of the world's largest volcanic eruption in 80 years. Local tribes people were the first to see the signs. "There was a flash of light from the sky,"
World of the Microscope
Science & Experiments Series
Fascinating, hands-on introduction to using microscopes, this book is packed with exciting projects
| `A `a flow `A`a (pronounced "ah-ah") is a Hawaiian term for lava flows that have a rough rubbly surface composed of broken lava blocks called clinkers. The incredibly spiny surface of a solidified `a`a flow makes walking very difficult and slow. The clinkery surface actually covers a massive dense core, which is the most active part of the flow. As pasty lava in the core travels downslope, the clinkers are carried along at the surface. At the leading edge of an `a`a flow, however, these cooled fragments tumble down the steep front and are buried by the advancing flow. This produces a layer of lava fragments both at the bottom and top of an `a`a flow.  |
  Glowing accretionary lava balls (bottom, 0.75 m in diameter) in front of moving `a`a flows. Both flows were erupted from Pu`u `O`o vent on the east rift of Kilauea Volcano, Hawaii. |
Accretionary Lava Balls Accretionary lava balls are roughly spherical masses that form on the surface of an `a`a flow. They range in size from a few centimeters to several meters in diameter. Lava balls grow when a small fragment of solidified lava rolls along the surface of an active flow and lava sticks or accretes to its surface. The growth of a lava ball is similar to the way a giant snowball grows when soft, sticky snow adheres to its surface as it rolls downslope. |
National Geographic's Restless Earth Collection Asteroids Deadly Impact/Volcano/Nature's Fury
The devastating powers of earthquakes, hurricanes, tornadoes, volcanoes and other earth-shattering forces of nature in dramatic scenes of destruction and inspiring human courage captured by the acclaimed filmmakers of National Geographic
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
Elenco Electronics
Electronic Snap Circuits by Elenco is an award-winning toy for budding engineers eight years old and above.