“Clay is a form of soil made up of very small particles of aluminum silicate created by the chemical weathering of rock.”
In the mountains of Turkey, melting snow turned to water that coursed over granite rocks and wore away at them. Teeny-tiny mineral particles were carried by the water down, down from the mountains and eventually into river- and stream-beds in the Tigris-Euphates valley. Over a long time, those particles became clay. You can dig clay out of the ground and make stuff from it, like pots. Clay is what they call plastic: you can form it into different shapes. Clay can be fired—heated at a really high temperature—to become hard and impervious to water. When they dig up ancient sites where people lived, archæologists find pieces of pottery that is thousands of years old.
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