This study is focused to characteristics of earth region vocabularies used in 7th curricula science textbooks for 3rd to 6th grades of elementary school. The numbers of earth region vocabularies are generally increased from the lower to the higher grade textbooks, ‘science’ and ‘experiments and observation’. In ‘science’ textbooks, numbers and use frequencies of earth region vocabularies are predominant in astronomy and atmospheric science vocabularies. Meanwhile, in ‘experiment and observation’, domains related with astronomy have relatively more numbers of the vocabularies but domains related with geology have higher use frequencies of those vocabularies relative to domains related with another areas. ‘Strata’ and ‘fossil’ of geology vocabularies, ‘air temperature’ of atmospheric science vocabularies and ‘sun’ and ‘planet’ of astronomy vocabularies are commonly the highest frequent in the use for science textbooks and experiment and observation. In the both books, earth region vocabularies are derived from 70% to 80% words of Chinese, below 10% of pure Korean, and rest of other languages. Additionally, cases of pure Korean vocabularies unpacked from professional nomenclatures, ones without previous explanations and multiple vocabulary applications to same phenomena are observed in the both books. Synthesizing above results, it is suggested that the reconsideration of domains related with each area of earth science and vocabulary uses assigned to above cases is necessary, in possible.