Day4 : why is the sea salty
今天讲的百科英语第4课：why is the sea salty
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以上内容来自专辑
- Day3: What's the difference between a sea and an ocean?329905:36
- Day4 : why is the sea salty327604:59
- Day5: Is the Red Sea really red?300303:57
- Day6: what did sailors fear the most295906:05
- Day7: who first sailed around the world285209:18
- Day8: what is sand made of278706:16
- Day9: how are caves made278302:56
- Day10 why do limpets cling to rocks273904:35
- Day11 :which fish has healights272108:41
- Day12: how deep is the ocean ？270902:56
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