Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
고육수학은 호수의 과거 환경을 연구하는 학문입니다.goyuksuhak-eun hosu-ui gwageo hwan-gyeong-eul yeongu-haneun hakmun-imnida.Paleolimnology is the study of past environments of lakes.