ISBN: 1231145781

Paperback, [EAN: 9781231145784], RareBooksClub.com, RareBooksClub.com, Book, [PU: RareBooksClub.com], RareBooksClub.com, This historic book may have numerous typos and missing text. Purch… More...

Paperback, [EAN: 9781231145784], RareBooksClub.com, RareBooksClub.com, Book, [PU: RareBooksClub.com], RareBooksClub.com, This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1831 Excerpt: ... offer another analogy, to add to the numerous resemblances which exist between granite and the rocks of the Trap family. In the columnar traps, whether basalt or greenstone, the crusts fall off in succession, in such a manner that the angular or prismatic form at length disappears; and the ultimate result is therefore a spheroidal body, destined finally to be also resolved into clay. It most frequently happens, that as the crusts are separated, they also fall to pieces, or become loose clay; but, occasionally, they retain a considerable degree of tenacity; although, by the changes of their colour from the natural dark blue to brown, it is evident that the iron has undergone a chemical alteration; being converted from protoxyde to rust. Where similar rocks possess a rude and imperfect prismatic structure, the same effects also take place; the surfaces of the prisms desquamating in such a manner as to leave a congeries of spheroidal or ellipsoidal bodies, destined, in the same way, to be ulti vo1.. 1. s mately resolved into loose earth. But these changes are not limited to prismatic trap only, since they occur in other and diflerent forms; being attended with the same finalresult, whatever the shape of the block.may have been, namely, the ultimate production of spheroids. Although, in some of these instances, it might be imagined that the effect of desquamation was produced, as in the case of the artificial granite columns, by the exposure of the surfaces to the air, it will, I believe, be found that, in nearly all, they truly depend on an internal concretionary structure. T he chief argument for this opinion will be found to consist in the effects which take place in those traps that are not jointed, as well as in those masses which affect a prismatic fract..., 14596, System Theory, 14545, Physics, 75, Science & Math, 1000, Subjects, 283155, Books<

ISBN: 9781231145784

Rarebooksclub.com. Paperback. New. This item is printed on demand. Paperback. 144 pages. Dimensions: 9.7in. x 7.4in. x 0.3in.This historic book may have numerous typos and missing text.… More...

Rarebooksclub.com. Paperback. New. This item is printed on demand. Paperback. 144 pages. Dimensions: 9.7in. x 7.4in. x 0.3in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1831 Excerpt: . . . offer another analogy, to add to the numerous resemblances which exist between granite and the rocks of the Trap family. In the columnar traps, whether basalt or greenstone, the crusts fall off in succession, in such a manner that the angular or prismatic form at length disappears; and the ultimate result is therefore a spheroidal body, destined finally to be also resolved into clay. It most frequently happens, that as the crusts are separated, they also fall to pieces, or become loose clay; but, occasionally, they retain a considerable degree of tenacity; although, by the changes of their colour from the natural dark blue to brown, it is evident that the iron has undergone a chemical alteration; being converted from protoxyde to rust. Where similar rocks possess a rude and imperfect prismatic structure, the same effects also take place; the surfaces of the prisms desquamating in such a manner as to leave a congeries of spheroidal or ellipsoidal bodies, destined, in the same way, to be ulti vo1. . 1. s mately resolved into loose earth. But these changes are not limited to prismatic trap only, since they occur in other and diflerent forms; being attended with the same finalresult, whatever the shape of the block. may have been, namely, the ultimate production of spheroids. Although, in some of these instances, it might be imagined that the effect of desquamation was produced, as in the case of the artificial granite columns, by the exposure of the surfaces to the air, it will, I believe, be found that, in nearly all, they truly depend on an internal concretionary structure. T he chief argument for this opinion will be found to consist in the effects which take place in those traps that are not jointed, as well as in those masses which affect a prismatic fract. . . This item ships from La Vergne,TN., Rarebooksclub.com<

ISBN: 1231145781

Paperback, [EAN: 9781231145784], RareBooksClub.com, RareBooksClub.com, Book, [PU: RareBooksClub.com], RareBooksClub.com, 1025612, Subjects, 349777011, Antiquarian, Rare & Collectable, 91,… More...

Paperback, [EAN: 9781231145784], RareBooksClub.com, RareBooksClub.com, Book, [PU: RareBooksClub.com], RareBooksClub.com, 1025612, Subjects, 349777011, Antiquarian, Rare & Collectable, 91, Art, Architecture & Photography, 67, Biography, 68, Business, Finance & Law, 507848, Calendars, Diaries, Annuals & More, 69, Children's Books, 274081, Comics & Graphic Novels, 71, Computing & Internet, 72, Crime, Thrillers & Mystery, 62, Fiction, 66, Food & Drink, 275835, Gay & Lesbian, 74, Health, Family & Lifestyle, 65, History, 64, Home & Garden, 63, Horror, 89, Humour, 275738, Languages, 61, Mind, Body & Spirit, 73, Music, Stage & Screen, 275389, Poetry, Drama & Criticism, 59, Reference, 58, Religion & Spirituality, 88, Romance, 5106747031, School Books, 57, Science & Nature, 4034595031, Science Fiction & Fantasy, 564334, Scientific, Technical & Medical, 60, Society, Politics & Philosophy, 55, Sports, Hobbies & Games, 83, Travel & Holiday, 52, Young Adult, 266239, Books<