. Review of reviews and world's work. MOUNT VESUVIUS IN FULL ERUPTION.(This photoprnph, by Alflerl & Lacrolx, of Milan, Is believed to be the first ever taken of a volcano in full activity.). UOW EAllTU MOVEMENTS ARE INDICATED—A FAULT IN TERTIARY SANDSTONE IN NORTHWESTERN NEBRASKA. (The drop was three feet on the left-hand side.) • OUR UNSTABLE TERRA FIRMA. BY N. H. DARTON.(Geologist, United States Geological Survey.) WE speak confidently of terra firma and con-gratulate ourselves when we lay footagain on solid mother earth, but the disasterin San Francisco lias doubtless shaken the faithof ma
. Review of reviews and world's work. MOUNT VESUVIUS IN FULL ERUPTION.(This photoprnph, by Alflerl & Lacrolx, of Milan, Is believed to be the first ever taken of a volcano in full activity.). UOW EAllTU MOVEMENTS ARE INDICATED—A FAULT IN TERTIARY SANDSTONE IN NORTHWESTERN NEBRASKA. (The drop was three feet on the left-hand side.) • OUR UNSTABLE TERRA FIRMA. BY N. H. DARTON.(Geologist, United States Geological Survey.) WE speak confidently of terra firma and con-gratulate ourselves when we lay footagain on solid mother earth, but the disasterin San Francisco lias doubtless shaken the faithof many in the stability of the terrestrial reality, the belief in terra firma is a earths crust is not rigid, but flexible andvibrating with tremors, mostly so delicate, how-ever, that only the most sensitive instrumentscan detect them. There are larger movements,also; which are so slow in progress that thechanges they make during a generation areliardly i)er^(i)tible. These, however, are the oneswhich are the most widespread, and earthquakes,tliough more conspicuous in action, are due tosmall but sudden movements generally havingonly a local effect. The earth ha
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1890
