The rise of air temperatures near Earth's surface over the past century is known as global warming. Earth has experienced periods of gradual wanning and cooling throughout its existence due to natural causes, such as volcanic eruptions and variations in the un 's output. However, scientists have attributed …
Earlyyears. Francis was the son of Charles de Valois-Orleans, comte d'Angoulerne, and Louise of Savoy. On the accession of his cousin Louis XII in 1498, Francis became heir presumptive and was given the Duchy of Valois. With his sister Marguerite, he was raised by his mother, who had been wid• owed at the age…
Daigo, in full DAJGO TENNO, personal name ATSUKIMJ (b. Feb. 6, 885; Kyoto-e-d. Oct. 23, 930, Kyoto), 60th emperor of Japan. He was unsuccess ful in continuing his father's policy of limiting the power of the important Fujiwara family, which dominated the Japanese government from 857 to 1160. The son of the emperor Uda, he ascended the t…
Centipedes generally remain under stones, bark, and ground litter by day. At night they hunt for and capture other small invertebrates. They move rapidly on from 14 to 177 pairs oflegs and have one pair of long, many-jointed antennae and a pair of jawlike, venomous claws just behind the head. The 25-mm ( 1-inch)-long …
A direct means of indicating the presence of concealed mineralization would be the ultimate in exploration. In many ways the.induced-polarization (IP) technique comes close to achieving this goal. it has been remarkably successful in locating concealed bodies containing even small percentages of metallic-luster minerals.
I…
When I put pen to paper in the summer of 1982, uppermost in my mind was the need to provide new practitioners with an introduction to the theory and practice of thermoluminescence (TL) dating, particularly those without a strong background in physics. Assimilating the corpus of specialist papers which at present define the theory and practi…
This practical step by step guide describes the key geological field techniques needed by today's exploration geologists involved in the search for metallic mineral deposits. The techniques described are fundamentals to the collection, storage and presentation of geological data and their use to locate ore. This book explains the various tasks which…
There are few places in the developed world particularly where the coal industry does not feel that it faces major challenges. Climate change, safety and a variety of other environmental.issues are just some of the concerns. In many cases these concerns are justified, and certainly in the developing world much more needs to be d…
Each year approximately 40 million metric tons of processed kaolin are sold around the world into markets ranging from brick making to paper coating. This functional versatility is a direct consequence of natural variability in deposit quality, which is controlled by mineralogy and processing. Poorer quality deposits, which contain relatively large …