pumiceous造句

例句与造句

1. Phonolites are vesicular and pumiceous in nature, although phonolites with trachytic texture are also present.
2. Block flows, lava flows, lava domes and some ignimbrites of pumiceous composition form this composite volcano.
3. In the Eifel region of Germany a trachytic, pumiceous tuff called trass has been extensively worked as a hydraulic mortar.
4. An eruption of Laguna Xilo?6100 years ago produced pumiceous pyroclastic flows that overlay similar deposits of similar age from Masaya.
5. The lower member consists mainly of unwelded ( unjoined ), but heavily compacted, pumiceous lapilli-tuff and crystal tuff strata.
6. It's difficult to find pumiceous in a sentence. 用pumiceous造句挺难的
7. The elongation of the microvesicles occurs due to ductile elongation in the volcanic conduit or, in the case of pumiceous lavas, during flow.
8. The Seelys formation, next in the order, consists of lithic tuff and pumice-littered lithic lapilli-tuffs, banded, pumiceous, crystal tuff, and densely welded crystal tuff.
9. Vitric ash particles from high-viscosity magma eruptions are typically angular, vesicular pumiceous fragments or thin vesicle-wall fragments while lithic fragments in volcanic ash are typically equant, or angular to subrounded.
10. Glassy forms of trachyte ( obsidian ) occur, as in Iceland, and pumiceous varieties are known ( in Tenerife and elsewhere ), but these rocks as contrasted with the rhyolites have a remarkably strong tendency to crystallize, and are rarely to any considerable extent vitreous.
11. These were lined with crumbling, rust-colored, oxidized ore, beneath which there was often unaltered galena . "'Sometimes "'these caves are lined and partly filled with "'a light, porous, pumiceous sponge of quartz " '.
12. The whole edifice and the adjacent Miocene El Plateado volcano, as well as the western flank of neighbouring Ojos del Salado volcano, are covered with a thick layer of pumiceous ash fall, probably produced by the collapse of an eruption column . ) north and Puntiagudo south is largely buried beneath the massif.