Once through in the field, the cuttings were brought back to the school where they were washed through a series of sieves. 제프가 아이들과 함께 체에 모인 모래, 점토, 조개껍데기를 가리키며 작업하고 있습니다(아래 사진). What a great learning experience this was for the kids and for OAI.