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
축조학은 지구의 구조와 움직임을 연구하는 학문입니다.Chukjo-hak-eun jigu-ui gujo-wa umjigim-eul yeonguhaneun hakmun-imnida.Tectonics is the study of the structure and movement of the Earth.