This new technology uses the combination of magnesium oxide and moisture to produce gelatinous magnesium hydroxide. Magnesium hydroxide reacts with phosphoric acid and carbon dioxide in the soil, allowing the soil to cure in 30 minutes. The key to making building materials is to use magnesium at 800°C to burn magnesium carbonate. Building materials produced with new technologies can replace river concrete embankments, drains and rural roads. Because of its low alkalinity, it has little effect on the growth of plants and microorganisms. It can be used as a fertilizer after it is crushed after being discarded.
A bookcase, or bookshelf, is a piece of furniture with horizontal shelves, often in a cabinet, used to store books or other printed materials. Bookcases are used in private homes, public and university libraries, offices and bookstores. Bookcases range from small, low models the height of a table to high models reaching up to ceiling height. Shelves may be fixed or adjustable to different positions in the case. In rooms entirely devoted to the storage of books, such as libraries, they may be permanently fixed to the walls and/or floor.
A bookcase may be fitted with glass doors that can be closed to protect the books from dust or moisture. Bookcase doors are almost always glazed with glass, so as to allow the spines of the books to be read. Especially valuable rare books may be kept in locked cases with wooden or glazed doors. A small bookshelf may also stand on some other piece of furniture such as a desk or chest. Larger books are more likely to be kept in horizontal piles and very large books flat on wide shelves or on coffee tables.
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