15. Ionic solids are hard‚ with very high melting points‚ but are very brittle. Explain. 16. Diamond and graphite are allotropes of carbon‚ composed of carbon atoms covalently bonded in a giant network solid. However‚ there are distinct differences in their properties. Diamond is extremely hard and brittle. Graphite is soft and slippery‚ often used as a lubricant. Graphite is also able to conduct electricity‚ whereas diamond cannot. Both‚ however‚ have extremely high melting and boiling
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your essay document for reference. Make sure that you name the piece by title‚ artist‚ location (where created)‚ and date (when created). Then begin to discuss the piece based on what its media‚ or what it’s made out of: oil paint‚ watercolor‚ graphite‚ charcoal‚ screen-printing‚ woodblock print‚ shell mosaic‚ etc. This should be the focus of your essay. Firstly‚ can you tell what it is made of without being told? Can you guess? How can you tell? Be specific! Second‚ how does the medium the
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districts are given below in the order of increasing antiquity. • Recent and Sub-Recent: Alluvium and other soils boulder and people beds. Miocene: - Siwaliks: - Sandstone with clay and lignite. Permian (Lower Gondwana):- Sandstone shape with Genes of Graphite coal. • Pre-cambnan (Buxa series): - Gneiss‚ Schist‚ Slate and Quartzite banded ferruginous rocks. • Achaeans (Daling and Darjeeling): - Gneiss‚ Schist‚ Slate and Quartzite. The north eastern part of the districts forms the foothills both of the
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Did you know that fishing dates back to around 40‚000 BC? Fishing has been around for a long time and has drastically changed over the years. In this speech I will tell you about the history of fishing‚ the history of the fishing rod and reel‚ and how fishing has changed over the years. The first way people fished was with a spear which was also called a harpoon. This kind of fishing is thousands of years old. The spear would have been made out of a stick that was sharpened or barbed. The fisherman
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billion years ago. The earliest life on Earth existed at least 3.5 billion years ago‚[6][7][8] during the Eoarchean Era when sufficient crust had solidified following the molten Hadean Eon. The earliest physical evidence for life on Earth is biogenic graphite in 3.7 billion-year-old metasedimentary rocks discovered in Western Greenland[9] and microbial mat fossils found in 3.48 billion-year-old sandstone discovered in Western Australia.[10][11] Nevertheless‚ several studies suggest that life on Earth
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drawing something. Am I right? Whether if it’s painting a picture‚ drawing doodles‚ or even scribbling on a piece a paper with a pen or crayon. Drawing is an art or technique of producing images on a surface‚ usually on paper‚ by means of marks in graphite‚ ink‚ chalk‚ charcoal‚ or crayon. As told in the Encyclopedia Britannica 2006. In kindergarten you could probably remember finger painting; wasn’t it fun? I think it was. Everywhere we go we always see pictures and drawings by different people.
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activity or skill of marking coherent words on paper and composing text. Writing has always held a special place in my heart‚ my mother used to write my bedtime stories and taught me how to write by the time I was three years old. The scratching of graphite against paper has always been a soothing sound to me. I do have fears about my own writing though and I believe that my relationship with writing is one of love and hate. Fear is an unpleasant emotion caused by the notion that something is dangerous
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Henry David Thoreau INTRODUCTION Henry David Thoreau was an American author‚ poet‚ abolitionist‚ naturalist‚ tax resister‚ development critic‚ surveyor‚ historian ‚ philosopher andtranscendentalist. Henry David Thoreau was a complex man of many talents who worked hard to shape his craft and his life. He is best known for his book Walden‚ a reflection upon simple living in natural surroundings‚ and his essay‚ Civil Disobedience‚ an argument for individual resistance to civil government in moral
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Executive Summary Breakaway Bicycle Company designs and builds custom bicycle frames to the exact specifications of the finest road and mountain bike racing professionals in the world. Breakaway has earned this right because its founder and master builder‚ Mike Giro‚ hand crafts road and mountain frames that satisfy the one common specification of all competitive cyclists — it helps them to win races. Since 1990‚ Breakaway has designed and built bike frames for racing professionals and those biking
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inductionless resistance. * as superconductors with high transition temperature In chemistry/nano-technology: * as molecular knots with special characteristics (Knotane) * as molecular engines * as graphene volume (nano-graphite) with new electronic characteristics‚ like helical magnetism. * In a special type of aromaticity: Möbius aromaticity * Charged particles‚ which were caught in the magnetic field of the earth‚ can move on a Möbius band. * The cyclotide
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