시원스쿨 아이엘츠/토플

답병해주시나 고생이많으십니다 secyion4 __script__에  A German alchemist called Johann Friedrich Bottger was asked by the king to make gold out of lead. 라는 문장에서 마지막 to make 

gold out of lead 부분에 lead를 어떻게 해석해요?

그리고 The main difference between ceramics made from clay and glass is that clay is made up of crysyalline plates which become locked together in the colling process whereas glass colls too quickly for crystals to form. 이부분에서 locked together어떠헤 해석이랑 for crystals to form은 의미상주어와 to부정사로보면되나요??