用Quizlet學習並牢記包含Unique physical char. of streams、Streams are linked to land.、Lateral stream movement等詞語及更多內容的單詞卡。
用Quizlet學習並牢記包含base level、water for most cities is taken from ;、97% of potable (fresh & usable) water is等詞語及更多內容的單詞卡。