Volcanic Dome
Volcano Terms and Definition


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




Volcano Book
Volcano & Earthquake DK Eyewitness Books
Eyewitness Books provide an in-depth, comprehensive look at their subjects with a unique integration of words and pictures.





Volcanic Dome

Volcanic domes are rounded, steep-sided mounds built by very viscous magma, usually either dacite or rhyolite. Such magmas are typically too viscous (resistant to flow) to move far from the vent before cooling and crystallizing. Domes may consist of one or more individual lava flows. Volcanic domes are also referred to as lava domes.

Volcanic dome atop Novarupta vent, Valley of Ten Thousand Smokes, Katmai National Park and Preserve, Alaska. The dome was erupted from the same vent that expelled about 15 km 3 of magma in an enormous explosive eruption in 1912.

  • The longest historical dome-building eruption is still occurring at Santiaguito Dome, which is erupting on the southeast flank of Santa Maria volcano in Guatemala; the dome began erupting in 1922.
  • Domes often erupt on the top and sides of stratovolcanoes. Of the 1,511 volcanoes known to have erupted in the past 10,000 years, only 40 are classified as independent volcanic domes not associated with another volcano.
  • The volcanic dome in the Cascades is Lassen Peak in northern California. Lassen Peak is part of a larger volcanic center, and its most recent eruption between 1914 and 1917 added a new lava flow to its summit.
  • The Mono Lake-Inyo Craters volcanic chain in north-central California consists of 13 domes; four erupted only about 600 years ago (Panum Crater, South Deadman, Obsidian Flow, and Glass Creek domes).
  • Three of the most active stratovolcanoes in the Cascades--Mount St. Helens, Mount Shasta, and Glacier Peak--have erupted lava domes at their summits. Before the 1980-1986 eruption of Mount St.Helens, its symmetrical summit cone was capped by a lava dome erupted between the 1500's and late 1700's.
  • Although volcanic domes are built by nonexplosive eruptions of viscous lava, domes can generate deadly pyroclastic flows. The sides of a dome or an erupting lava flow on a dome can collapse down a steep slope to form a hot avalanche of hot lava fragments and gas (pyroclastic flow). Recent eruptions of lava domes at Unzen volcano in Japan and at Soufriere Hills in Montserrat have forced thousands of people from their homes.
  • Some domes erupt obsidian, which is volcanic glass that may form in rhyolite or dacite lava flows. Most obsidian is black, but red, green, and brown obsidian is known. Obsidian forms when magma is cooled so quickly that individual minerals cannot crystallize.
volcanism
Volcanism
Volcanic eruptions are the clear and dramatic expression of dynamic processes going on in planet Earth. The author, one of the most profound specialists in the field of volcanology, explains in a concise and easy way how to understand manner the basics and most recent findings in the field of volcanology.





Super volcano - It's Under Yellowstone. And It's Overdue

A subterranean sea of molten lava that scientists are sure will burst through the Earth's crust it's just a question of when. And if the resulting super-volcanic eruption is anything like the last one on earth which plunged the world into darkness for six years, tipped us into the last Ice Age and reduced the human population to just 2,000 people we're in for one explosive ride

Volcano Glossary


  • Includes microscope and digital camera
  • One eyepiece adaptor, four prepared slides, and eight blank slides
  • One pair tweezers and four plastic bags
  • One explorer book
  • One software CD Rom and one special planet earth CD
  • Professional quality microscope with digital eyepiece
  • Ulead Photo Explorer software included; editing and text adding capability
  • Magnification from 40X to 400X
  • Cordless LED light source
  • 1.3 Mega Pixels
  • USB Computer Connection
  • 24bit RGB Color
  • Video or Still Image Capture
  • AVI Video Format
Planet Toys Planet Earth Digital Microscope Kit
Ultimate 400x Digital Microscope
Digital USB Microscope Video Camera

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Digital Blue: QX3 Microscope
Connect the microscope to your PC, put something under the scope...the image is displayed on your monitor actual size, 10X, 60X, or 200X. You can take snapshots and videos of your specimens, make time-lapse movies, create slideshows complete with sound, transitions and more. You can even e-mail your work to family and friends! Includes microscope, tweezers, specimen jars and containers, sample slides, tweezers, and software.



Source:
U.S. Department of the Interior