By W. S. MacKenzie
Atlas of igneous rocks and their textures A spouse quantity to the Atlas of Rock-forming Minerals in skinny part, this full-colour guide is designed for use as a laboratory guide either through ordinary scholars of earth sciences venture a learn of igneous rocks in skinny part lower than the microscope, and by means of extra complex scholars and academics as a reference paintings. The ebook is split into components — half One is dedicated to images of the various universal textures present in igneous rocks with short descriptions accompanying every one photo. half illustrates the looks of examples of a few sixty of the most common (and a couple of now not so universal) igneous rock kinds; every one photo is observed via a short description of the sector of view proven. approximately three hundred full-colour pictures are integrated, and in lots of situations an identical view is proven either in plane-polarized mild and below crossed polars. a short account of ways skinny sections might be ready is incorporated as an appendix. it really is believed that the novice geologist utilizing those directions may be in a position to make his personal skinny sections and, by way of a comparatively basic microscope, benefit from the examine of rocks in skinny part.
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This increase is partly due to a revised taxonomy, but in many cases they are genuine changes brought about by increased habitat loss and hunting. e. an increase from 29 to 46 Endangered species and 13 to 19 Critically Endangered species. For the birds, the most significant changes have been in the Procellariformes (albatrosses and petrels) which have increased from 32 to 55 species (all 16 species of albatross are now listed as threatened whereas in 1996 there were only 3—this is due to the impact of longline fisheries) and the Sphenisciformes (penguins) which have doubled in number from five to ten.
As populations are disappearing in Southeast Asia, there are disturbing signs that the focus of the harvest will shift to the Indian Subcontinent, and perhaps even further afield to the Americas and Africa. It is also known that other Asian species, such as snakes and 10 Red List 2000 06 September 2000 16:14:10 Color profile: Generic CMYK printer profile Composite Default screen Analysis Table 2. Changes in numbers of species in the threatened categories (CR, EN, VU) from 1996 to 2000 CR 1996 EN 2000 1996 VU 2000 1996 2000 Group Mammals 169 180 315 340 Birds 612 610 168 182 235 321 704 680 Reptiles 41 56 59 74 153 161 Amphibians 18 25 31 38 75 83 Fishes 157 156 134 144 443 452 Insects 44 45 116 118 377 392 257 222 212 237 451 479 Molluscs Note: Crustaceans and other invertebrates are not included here, as there are virtually no changes in the counts for those groups since 1996.
Then follow Colombia, China, Peru and India with 78, 76, 75 and 74 species respectively. The overall results are very similar to those for 1996 with all the same countries appearing except for Papua New Guinea (32 species) which is now replaced by Tanzania (33 species). The ranking of the countries has changed because of increases in numbers of threatened species. The countries with by far the highest percentage of threatened species are New Zealand and the Philippines with 42% and 35% respectively, which matches the findings in 1996.
Atlas of Igneous Rocks and Their Textures by W. S. MacKenzie