Because slate is a hard, impermeable rock, which splits easily into thin sheets, it is ideal for making roofing tiles.
Marble has an attractive texture and colour and can be cut and polished. Because of this, it is used to make floor tiles and wall tiles. Some statues are made from marble too.
Chalk is a rock that is formed from the skeletons of tiny sea animals. It wears away very easily which is why it ideal for making sticks of chalk to write on blackboards.
Granite is a coarse-grained rock that is hard and impermeable. It is often used to make steps and roads as it is a rock that doesn't wear away easily.
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