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Volcanoes "...many noteworthy features. Excellent for introductory and review
purposes..." A spectacular visual study of basaltic and andesitic volcanism. Eruption scenes of the Hawaiian volcanoes - with their massive flows of dark, viscous lava - are contrasted to the explosive nature of Mount St. Helens and its ash clouds derived from water-rich magma. Explains hot spot and |
| subduction
zone volcanism and their relationships to broader tectonic theory. Accurate and
up-to-date. 15 minutes VHS VCT-15 ...$69 DVD DVT-31 ...$70 |
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