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However, the chemical composition of water on comets (hard water) consists of a heavy hydrogen, i.e. a hydrogen atom that contains both a proton and a neutron in its nucleus. This is different from the water currently present in the oceans of Earth, which is essentially a combination of ...
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?
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 ...
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...
三、 根据课文内容, 将短文补充完整。How to protect the Earth?Water is useful. We use water to clean_ things. There's not much_ water in many places.We shouldn't waste water. We should reuse and save it.Most of our energy comes from coal and oil . We use energy to drive cars. ...
Small army said: mom, water is our common earth resources, we here dont lack water, but in some places, the kid doesnt even have a drink of water, all we should pay attention to save water! Her face went red when she heard it. The small army again say to the mother, the mother ...
Water is so vital to our survival, but strangely enough, we don’t know the first thing about it—literally the first. Where does water, a giver and taker of life on planet Earth, come from? When I was in junior high school, my science teacher taught us about the water cycle—evapora...
water, often because, how, planet, warni.earth, clean, difficult, they, possible Astronauts have lots of important work to do in space. They must stay healthy to do a good job. Part of staying healthy is keeping(51)___.But how do astronauts wash themselves in space?Can they take a ...
How much of Earth is land? How deep is the Ogallala Aquifer? How much of the earth's surface is sedimentary rock? How big is the Great Artesian Basin? How much groundwater does Australia use on annual basis? What is the average temperature of groundwater?