 | | Book | | minerals. For example, rock crystal, a kind of quartz, was supposed to prevent toothache and internal...elements. Common silicates include feldspar minerals, quartz, the micas, olivines, pyroxenes and amphiboles...rock granite consists essentially of feldspars and quartz, together with micas or other silicate minerals...minerals occur widely (see page 13). For example, quartz, feldspars and micas occur in granite; calcite...calcite forms limestones; and many sands consist of quartz grains. But to find really good specimens, especially |  | | | | minerals. For example, rock crystal, a kind of quartz, was supposed to prevent toothache and internal... Common silicates include feldspar - minerals, quartz, the micas, olivines, pyroxenes and amphiboles...rock granite consists essentially of feldspars and quartz, together with micas or other silicate minerals...minerals occur widely (see page 13). For example, quartz, feldspars and micas occur in granite; calcite...calcite forms limestones; and many sands consist of quartz grains. But to find really good specimens, especially |  | | Journal (volume) | | De Agostini website at: UK: AUS: SA: NZ: Rose quartz RO Ruby RU www.deagostini.co.uk www.deagostini...surface . u, tD -·3 se uar Rose quartz is an uncommon form of quartz that is often used in necklaces...shapeless specimens. D espite its name, rose quartz can in fact range in colour from pink through to...structure of the mineral. This rose-coloured variety of quartz is regarded as too valuable to be put to any of...of a clock mechanism, for example. Instead, rose quartz is set aside to be made into beautiful carved ornaments |  | | Book (edition) | | mapping them, we can establish the extent of the area over which a bed was deposited and can chart the...place in the area containing the rocks and interpret the geological history of the area. Our conception...little more than 250 billion cubic miles 1 and its area nearly 200 million square miles. 2 Once these facts...attraction with that of a large ball of lead or quartz of known weight, and thus "weigh" the earth. Its...14/6) X 7,9003 = 250 billion cubic 1niles (plus). 2 Area = 3.14 X 7,900 2 = 196 million square miles (plus) |  | | Book | | PINNACLES (Lower picture) . estas es DAVIDSON GLACIER, ALASKA, SHOWING “AcTION ON THE VALLEY’S WALLS...RETREATING GLACIER (Lower picture) .. aitver he Dieteeee Oe Swirt CURRENT VALLEY IN GLACIER NATIONAL Park...Park, FORMED BY STREAM AND GLACIER ACTION YOSEMITE VALLEY FROM WESTERN ENTRANCE. THE RESULT OF GLACIAL...257 Esker, DEPOSITED BY A STREAM IN THE GREAT GLACIER (Lower picture) . ... "257 A LANDSCAPE OF THE CoaL...EROSION 27 that of a sandstone, the mineral grains quartz) of which are held together by carof lime. The |  | | Book (edition) | | Similarly a detailed discussion of the mechanics of glacier motion, which has inherent interest but is not...medium, generally water but more rarely air or glacier ice; and III, nieta1norphic rocks, formed by the...within the Earth's crust. Threefourths of the land area of the globe is underlain by sedimentary roclrs... and thus the clay acquires a yellowish color. Quartz resists chemical weathering more successfully than...the associated grains of quartz remain essentially unchanged. Since quartz is quite hard and has no cleavage |  | | Book (edition) | | commissioned to photograph features in the local area, and Deborah Bowen of Oxford University Press, who...much more difficult to determine how rocks in one area correlate with rocks in another, even when the areas...identifiable layers can be traced or mapped into another area, then the correlation is firm. Also, if each layer...can be identified in the same sequence in a nearby area, then correlation can be made with some assurance...or the strata present in one area do not show up in another, nearby area. Correlation, of course, becomes |  | | Book | | field observation. When studying the geology of an area, field observations, laboratory work and information...temperatures were much higher (about 300°C in the area in which the Earth formed). Volatile materials could...planets formed from dust grains. The gas in this area was probably swept outwards as the newly forming... HEIGHT OR DEPTH (m) LAND SURFACE AREA (km2x106) SEAFLOOR AREA (km2x106) 106.6 18.2 1000-3000 33...colour, e.g. quartz can be transparent (rock crystal), purple (amethyst), white (milky quartz), pink (rose |  | | Book | | istribution of the superficial deposits in the Glasgow area (based on material prepared by the Institute of...Loch Maree. 52. The structure of the Cromarty Firth area. 15 243 245 263 26g 271 273 280 284 292 295...Tweed, is an ideal centre from which to explore the area, but its unspoiled architecture and its great cobbled... but this gives way southwards, in the Silurian area, to a complex upfold. Since these primary folds... ..., , , ..... . ' ~ Volcanic vents Basalt & Quartz-porphyry 1 mile 1km Wester Hill ..... __ ✓ |  | | Book | | Diorite Andesite Acid rocks Granite Granodiorite Quartz porphyry and vein rocks Acid lavas Alkaline rocks...quite a perfect sphere. The planet has a surface area of 510 x 10 6 km 2, of which some 29 per cent is...shelf which surrounds the continents, the total land area is nearly 35 per cent of the whole surface. In other...circum-Pacific belt, and about 22 per cent in the Alpine area. Many smaller shocks also occur in zones of submarine...upwards. The observed intensity at points in the area affected can be marked on a map, and lines of equal |  | | Book | | compared with the rugged, heavily faulted and glacier-gouged volcanic rock peaks of western Scotland... all comprising myriads of colourless or white quartz grains but differing in their range of colours...a building stone. Because of its tough, angular quartz grains, however, the pale arenaceous rock known...light-coloured because they are composed essentially of quartz crystals together with two other minerals known...new rock type. In a sandstone, for instance, the quartz grains are squeezed so closely together that they |  | | Book (volume) | | in a considerable extension of the biographical area, even as regards individuals of British nationality...Lampeter, 1880-1881. Guide to Grindelwald; Guide to Switzerland; The Alps in Nature and L History; &c. Editor...navigable as far as St Omer; and a river of Switzerland, in the cantons of Lucerne and Aargau, which...river which both rises and ends entirely within Switzerland. Its total length (including all bends) from...ft., while its official. AARAU—AARHUS drainage area is 6804 sq. m. It rises in the great Aar |
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Aletsch Glacier, Aletsch area, Valais, Switzerland