Secrets de roches

Clay is a particularly surprising rock. Dry it is fragile, but once it comes into contact with water it becomes malleable and under the influence of fire it can permanently stiffen.

Much of the mountains and crust of the continents are made up of this almost unbreakable rock. This rock, considered the foundation of the terrestrial world, is granite.

There is a rock that shapes the beauty of the world more than any other: sandstone. Made up of grains of sand, this rock is both porous and strong and has an almost organic bond with living organisms, and especially with animals and humans.

The geological timeline shows a very young rock. It comes from the bowels of the earth and is born from the power of volcanoes. This rock is at the root of iconic landscapes and legends.

This rock is recognisable by its white colour. The great builders chose it for their most impressive monuments. But even more surprisingly, it was created from living organisms and has retained a connection with them.