Graphite is a form of carbon. It has the interesting property of being made up of very thin layers that can be easily rubbed off, so is perfect for drawing with. Graphite is the main ingredient of the "lead" in lead pencils.
Graphite can also conduct electricity, so it has many applications in engineering and electronics.
Hay is dried grass or other crops that has been stored to be fed to animals. Hay usually has the seed heads of the grass in it as well as just the stems and leaves. Hay is different to straw.
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Ivory is essentially teeth. Ivory usually refers to elephant's tusks, but any tooth large enough to be carved can be used as ivory. Before plastic was invented, ivory was commonly used for making ornaments, buttons, handles of knives and forks and the most familiar use - piano keys.
Today the trade in ivory is banned in most countries, and plastic or ivory substitutes are used where ivory was once used.
Latex is the milky sap of many different plants. One tree in particular, the Para rubber tree, is used for commercially producing rubber.
Rubber is used in a huge variety of ways. It is used to make rubber bands, erasers, elastic that you find in the waistband of clothes, drive belts inside a car engine, gumboots and the biggest use is tyres.
