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
만년설은 지구의 기후 변화에 중요한 역할을 합니다.mannyeonseoreun jiguuui giho byeonhwae jungyohan yeoghal-eul hamnida.The ice cap plays an important role in the Earth's climate change.