During firing, the temperature causes chemical changes in the clay, making it hard and strong.
(the temperature; causes; chemical changes in the clay; T:During firing) Context(the temperature causes,List([15, 37))):(the temperature; causes chemical changes in the clay making; it hard and strong)
the temperature causes,List([15, 37))
the temperature the temperature
causes causes chemical changes in the clay making
chemical changes in the clay T:During firing
it hard and strong