Detail Not Always Ring of Truth; Dendrochronology   Oleh:  [s.n] Jenis: Article from Bulletin/Magazine Dalam koleksi: The Economist (http://search.proquest.com/) vol. 407 no. 8841 (Jun. 2013), page 73-74. Topik: Trees; Mercury; Research Ketersediaan Perpustakaan Pusat (Semanggi) Nomor Panggil: EE29 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada     Lihat Detail Induk Isi artikel Researchers often look at chemicals stored in them when trying to reconstruct past environments. Like all history books, though, they can be unreliable. And in the case of one particular chemical of interest, mercury, Jose Antonio Rodriguez Martin of the National Institute for Agricultural and Food Research and Technology, in Madrid, and his colleagues have just shown how unreliable they are. Rodriguez Martin was studying pines on La Palma, in the Canary Islands. He knew that Hoyo Negro, one of the island's volcanoes, had erupted violently in 1949, and believed that the clouds of ash and explosive ejections of rock from the eruption had destroyed all of the pines nearby. However, as he describes in Naturwissenschaften, when he and his team examined the area, they were stunned to discover a revenant from this cataclysm just 50 metres from the crater. Like a battle-scarred soldier, this now-great pine had many half-healed wounds in its trunk. It had survived those. It did not, however, survive Dr Rodriguez Martin's axe. He reluctantly felled it and, for comparison, collected a tree of similar age that was growing 400 metres from the eruption site, and another that was 16km away. One unpleasant element often ejected in volcanic eruptions is mercury. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Kembali

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