Water is an essential part of our planet. Without ____, no life would be possible. We all about the water formula and its cycle in ____. We have also seen how much water there is in the oceans on ____, but... do we know how water on our planet? One of the most known theories says that water in our ____ because asteroids and ____ have water in them in the formof ice.

Reading

由
列印
嵌入

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?