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About this book
The frontispiece presents sections of igneous rocks illustrating the passage from glassy to crystalline structure, including a rock built entirely of crystals. The account of volcanic cones explains that cones formed entirely by viscid lava often have a slight central depression, which is occasionally absent altogether. The description of volcanic growth says regular, continuous eruptions from the same vent leave the crater’s size unchanged while the mountain grows taller and broader.
The discussion of the earth’s surface reports a proposal that slightly differing rates of heat conduction could account for surface inequalities and past continental movements. The account of scoria cones notes that subsequent ejections may sometimes fill the central vent.
About the author
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Book facts
- Author
- John W. Judd
- Pages
- 245
- Language
- English
- Genre
- Popular Science
- Formats
- PDF, EPUB, Read online