riggered, leading to more than 20,000 deaths. However, until now, there has been no proper quantification of loss of life from landslides. This paper by David Petley of Durham University presents the results of a study to record the number of people killed by landslide worldwide for a seven year period between 2004 and 2010. The results show that more than 80,000 people were killed in this period, which is a rate that is about ten times more than previous studies had suggested. The data suggests that more people are killed each year by landslides than die from river floods. The majority of deaths occurred in Asia, especially in China, the Philippines, Indonesia, India, Nepal, Pakistan, and Colombia. Petley also shows that there is a relationship between the number of recorded fatality-inducing landslides and the population density in mountainous countries, which suggests that unless action is taken to mitigate dangerous slopes, loss of life from landslides will increase as the global population continues to grow.
Microbial action formed Jurassic Mn-carbonate ore deposit in only a few hundred years (rkt, Hungary)
Mrta Polgri et al., Institute for Geochemical Research, Hungarian Academy of Sciences, Budarsi str. 45, 1112 Budapest, Hungary. Posted online 1 August 2012; doi: 10.1130/G33304.1.
Mrta Polgri and colleagues studied the The rkt, Hungary, manganese (Mn) ore, hosted by Jurassic black shale, using high-resolution mineralogical, microtextural, and chemical methods. The identified two independent superimposed biostructures consisting of rhythmic laminations that provide important proxies for paleoenvironments and duration of ore formation. Millimeter-scale laminae reflect a depositional series of Fe-rich biomats, mineralized microbially produced sedimentary structures. These biomats formed at the sediment-water interface under dysoxic and neutral pH conditions by enzymatic Fe2+ oxidizing processes that may have developed oPage: 1 2 3 4 5 6 7 8 Related biology news :1
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