Acknowledgement
본 연구는 2020년 공주대학교 학술연구지원사업의 일환으로 수행되었으며, 일부 한국연구재단(2019R1A2C1008490)과 충청씨그랜트 사업의 지원을 받았습니다. 자료 정리를 도와준 공주대학교 지구과학교육과 김강우 학생과, 논문을 세밀히 검토해 주시고 좋은 의견을 주신 심사위원님들께 감사드립니다.
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