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a table of contents is a list of chapters in a book

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A Index is a list of important topics found in the back of a book

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A Glossary is kind of like a mini dictionary in side of your book it's very useful like for example if someone was reading this book and they came across a word the did not know and went to the glossary and found that word and started reading again.

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To point out different sections to organize topics

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words under a pictures that tell you who or what they are

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charts and graphs are when the book is trying to compare something

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A drawing(s) or a photo(s)

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A diagrams are drawings or they can be photos that has a label (or labels) that tell parts of something .

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For an example we have a bold title so that the reader can know that this a new chapter or that we are staring a new subject.