This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ...The lava streams consisted of viscous material and cooled so rapidly as to form volcanic glass. The explosive eruptions which followed the flows of lava opened craters, some of which are very remarkable. The whole country for many miles about is covered with a thick coating of volcanic ashes. After the ...

Practical Physiography 2015, Arkose Press

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