Chalk, limestone and marble are all forms of calcium carbonate. Chalk and limestone are formed in marine environments while marble is metamorphosed limestone.
Chalk is many different things. Limestone is a harder form of chalk, and marble is chalk heated up. There is lots of chalk in England, the White cliffs of Dover are made of chalk, and lots of other things are made of chalk, not just in England, but in some other countries. The chalk runs out of caves made by the water in little streams, and thus deposits it in the rivers. If you drink water out of one of these rivers, it’ll taste kind of hard. That’s the chalk in the river that’s making it taste hard.
The 'silver Itchen' - one of the most famous chalk streams of Hampshire in England which attracts anglers from all over the world.
The South Downs area of England is a series of chalk hills in the Hampshire, East Sussex, West Sussex counties. The chalk landscape acts like a giant sponge, and stores water. A huge underground reservoir provides fresh drinking water for over 1 million people living in the area.
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