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
고지자기학은 지구의 고대 자기장을 연구하는 학문입니다.gojijagihak-eun jigu-ui godeu jagijang-eul yeonguhaneun hakmunimnida.Paleomagnetism is the study of the Earth's ancient magnetic field.