GERARDO+B

= ﻿ = == = = = Introduction =

Have you ever wondered what audio cd's are made of? Some cd's are made of polycarbonate Plastic,Aluminum, and Acrylic. I want to learn about cd's because i wanted to learn how they where made. I also wanted to learn how the memory works. A audio cd is a disc that could hold music,movies, and information. Lately people stop using cd's as much as they used to. people mostly us the for movie. =

= =Research Questions= 1.How does a cd work? 2.Does the disc have any paterns? 3.How thin is the cd? 4.How many layers does a disc have? 5.What are disc's used for? 6.What are disc's mad of?

**Annotated Bibliography**

Topic:HOW CDS WORK

eil.com, how does cd's work. "//eli.com.// web. 6 may 2011

The source is about how does a cd plays it is also about how a cd's memory is read. I trust the website. its helpful because it shows me how the disc gets played by a cd player and many more things. = = = Brain, Marshall. "How CD's Work." //howstuffworks.com//. HowStuffWorks, Inc., 2011. Web. 2 May 2011. =

this source about how cd's work. the source tells me how many layers the cd has and that the cd has bumps and spirals. i trust the source because its a big website. i also trust it because it gives me information about the person who wrote the article. the source helps me because it tells me how the cd works. its useful because i learned all about the spiral,bumps,ad material.

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= =Vocabulary= 1. polycarbonate plastic DEF:are a particular group of polymers that are moldable under heat; as such, these plastics are very widely used in modern manufacturing. 2.acrylic DEF:artificial fiber made from a special group of vinyl compounds, primarily acrylonitrile. Acrylic fibers are thermoplastic soften when heated, reharden upon cooling, have low moisture regain, are low in density, and can be made into bulky fabrics. They wash and dry easily and are dimensionally stable 3.aluminum DEF:A silvery and ductile member of the poor metal group of elements 4.audio cd DEF:the audible part of a transmitted signal =

My Presentation Plan= I will introduce my topic I will talk about my interest in the topic Talk about what they are made of Show what kind of layers are in the cd Tell you how the cd works End it with audience questions

= =April 29th, 2011=

My topic is: How do a CD work?

Today I am trying to answer the question(s):

http://www.howstuffworks.com/cd.htm

= MAY 6TH, 2011 = MY TOPIC: how does a compact disc work (how does it play)

today i am answering the source #2 questions

http://eil.com/explore/guide/cd_works.asp