Summary
Contents
Subject index
This unique addition to reference literature provides an introduction to the major concepts and contemporary issues that are essential for students of environmental science and environmental studies to know. With over 200 entries authored by world-class names like Anthony Brazel, John Day and Edward Keller, this text is divided into six sections: Environmental Science, Environments, Paradigms & Concepts, Processes & Dynamics, Scales & Techniques, and Environmental Issues.
Volcanoes and Volcanism
Volcanoes and Volcanism
Volcano’ is defined in the AGI Glossary as ‘a vent in the surface of the Earth through which magma and associated gases and ash erupt; also, the form or structure, usually conical, that is produced by the ejected material’ and tephra as ‘a general term for accumulations of all hot fragments ejected from a volcano, including ash, cinders, blocks, and bombs – also called ‘pyroclastic material’.
At every minute of every day somewhere on the Earth, both on land and beneath the sea, a volcano is actively erupting gas, tephra, and lava. It is a completely normal happening because volcanism is one of the ways the Earth continually loses heat and gas. Volcanism occurs primarily in three plate tectonic settings, and ...
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