covering+or+protecting+layer

  • 31Fern — /ferrn/, n. a female given name. * * * Any of about 10,000–12,000 species (division Filicophyta) of nonflowering vascular plants that have true roots, stems, and complex leaves and reproduce by spores. Though ferns were once classified with the… …

    Universalium

  • 32Deepwater Horizon oil spill — 2010 oil spill and BP oil spill redirect here. For other oil spills in 2010, see 2010 oil spill (disambiguation). For the 2006 oil spill involving BP, see Prudhoe Bay oil spill. For the drilling rig and explosion, see Deepwater Horizon… …

    Wikipedia

  • 33Skin — For the article about skin in humans, see human skin. For other uses, see Skin (disambiguation). Skin A diagram of human skin …

    Wikipedia

  • 34conservation — conservational, adj. /kon seuhr vay sheuhn/, n. 1. the act of conserving; prevention of injury, decay, waste, or loss; preservation: conservation of wildlife; conservation of human rights. 2. official supervision of rivers, forests, and other… …

    Universalium

  • 35Roman infantry tactics — refers to the theoretical and historical deployment, formation and maneuvers of the Roman infantry from the start of the Roman Republic to the fall of the Western Roman Empire. The article first presents a short overview of Roman training. Roman… …

    Wikipedia

  • 36Life Sciences — ▪ 2009 Introduction Zoology       In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… …

    Universalium

  • 37Critical infrastructure protection — Public infrastructure Assets and facilities Airports · Bridges · Broadband& …

    Wikipedia

  • 38Critical Infrastructure Protection — or CIP is a national program to assure the security of vulnerable and interconnected infrastructures of the United States. In May 1998, President Bill Clinton issued Presidential directive PDD 63 [ [http://www.fas.org/irp/offdocs/pdd/pdd 63.htm… …

    Wikipedia

  • 39Shoe — This article is about footwear. For other uses, see Shoe (disambiguation). Various shoes for sale in Quarry Bay …

    Wikipedia

  • 40Shark — Taxobox name = Shark fossil range = Late Devonian Recent image width = 250px image caption = Grey reef shark, Carcharhinus amblyrhynchos regnum = Animalia phylum = Chordata subphylum = Vertebrata classis = Chondrichthyes subclassis =… …

    Wikipedia