You may use interjections in casual and in creative writing. You should not use interjections in formal writing, like book reports and research papers. You can use a noun, a verb, or an adverb as an interjection. Noun as an interjection: 1  Foolishness! 2  Your dog is not smarter than my dog! 3  Clap! 4  He deserves some applause for that performance.
Here is a look at the composition of a compact disc or what CDs are made of. Answer: A compact disc or CD is a form of digital media. It is an optical device which can be encoded with digital data. When you examine a CD you can tell it is mainly plastic. In fact, a CD is almost pure polycarbonate plastic.
Jumping Discs - Set of 3. These little metal discs are bimetallic - they are made from two different metals - and this enables them to perform an amazing physics trick! The disc is slightly curved, and if you heat the disc in your hands you can then 'pop' the disk so that it bends the other way.