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Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536

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BuyFindarrow_forward

Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536
Textbook Problem

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FIGURE 11.26 Mauna Loa, on the island of Hawaii, clearly displays the dome, or convex, shape of a classic shield volcano. From its base on the ocean floor to its summit at 4170 meters (13,681 ft) above sea level, Mauna Loa is almost 17 kilometers (56,000 ft) tall.

Why do Hawaiian volcanoes erupt less explosively than volcanoes of the Cascades or Andes?

To determine

The reason why Hawaiian volcanoes erupt less explosively than volcanoes of the Cascades or Andes.

Explanation

Hawaiian volcanoes are shield volcanoes. Shield volcanoes are broad, gently sloping dome-shaped cones formed by the accumulation of hot and fluid basaltic lava layers that flow long distance before solidifying. The shape of the shield volcano resembles a warrior shield resting on the Earth’s surface.

These volcanoes emit hot mafic lava with temperatures of about 1,090 degrees Celsius. The major feature is the outpouring basaltic lava flows and occasionally, volcanic gases and steam eject fountains of molten lava for a few hundred meters into the atmosphere. These volcanoes contain a central vent and magma that sometimes erupts from the fissures along the flanks of the volcano called as flank eruption. Example: Hawaiian shield volcanoes.

The Andes and Cascades volcanoes are composite cones. Composite cones are considered as the classic volcano shape with concave slopes that are steep at the top and gentle at the bottom...

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