Books that are surrounded by oxygen will turn yellow, so basically, all books since oxygen is constantly surrounding us. Oxygen-rich conditions are very bad for paper, which gives them the yellow tiny. This is actually called lignin oxidation! Lignin oxidation gives it a yellow or brown colour as you said. Yellow comes first, then brown after.
I hope this helped a bit! :)
For Argentina:
1. To provide reputable websites with accurate information, you can go to encyclopedia.com, nationalgeographic.com, britannica.com, etc. (don't simply default to Wikipedia, as it's not always a reliable source).
2. You can talk about wanting to visit Argentina due to their unique language. Although the country speaks Spanish, the dialect is rather different. The "ll" sound, instead of being pronounced as "y," is actually pronounced as "sh" or "j." This means that "me llamo" is pronounced as "me sha-mo" instead of "me ya-mo."
3. Since Argentina is a large country with many different landscapes, you can talk about wanting to see such diverse geography. For example, there are huge salt flats in the north, a cosmopolitan city (Buenos Aires) as you go further down, and finally a region called Patagonia, which has incredible hiking views and even glaciers, as you continue going down the country.
4. The tourist attractions are similar to the answers in number 3, because it is possible to go on excursions in the salt flats and the glaciers. Additionally, Buenos Aires itself, as the capital of the country, has several tourist attractions, including soccer games, flea markets, etc.
5. This answer will actually depend on whether or not you know anyone who has been to Argentina. It is not the most popular vacation spot, but is gaining popularity within the tourist industry.
6. Again, this will depend on whether or not you know anyone who has been to Argentina. In general, Argentina gives off a very European impression, although it is in Latin America. The people are very proud of their European descent, as there is much Italian and German ancestry among these people.
Homophones........................................
