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About 70 percent of our planet’s surface is covered with water, and it plays an important role in our daily lives. But how did water get on Earth in the first place?
Going with the belief that water did not exist on Earth or any other planet at the birth of the solar system, it has been speculated that the water must have flown in from the outer reaches of the solar system, riding on comets,asteroidsor meteoroids. Since they had been at such a gr...
Do you know how much of the earth is covered by water? All life on the planet needs water. But some water on our planet is not clean. In order to keep water clean, we mustn't throw rubbish into the seas, rivers, or lakes. We can also use special machines to clean water. Then ...
根据文中“She said that she loved him as much as she loved salt. Her answer made the king very happy.” 她说她爱他就像爱盐一样。她的回答使国王非常高兴。可知,故答案为The king felt very happy.【小题5】细节理解题。根据文中“But for many years, salt’s most important job was to ...
How much oxygen is in the Earth's crust? How much oil is in the Permian Basin? How did the Great Artesian Basin form? What is groundwater in the water cycle? How fast does most groundwater move in aquifers? How was the Great Artesian Basin formed?
Water is the most valuable resource on the earth. Water is the necessity of our life and we must drink it everyday. Now many people can not drink clear water because many of them are badly polluted. So in order to save water the first thing we should do is reduce water pollution. In...
How did Earth get such a strange moon? Exploring the giant impact theory What's the difference between a young exoplanet and an old one? Large alien planets may be born in chaos, NASA's retired exoplanet-hunter finds The first and most widely accepted theory is the core accretion mod...
There is___wather on the earth.地球上有很多水How much water is there on earth?地球上有多少水?
Water is the most valuable resource on the earth. Water is the necessity of our life and we must drink it everyday. Now many people can not drink clear water because many of them are badly polluted. So in order to save water the first thing we should do is reduce water pollution. In...