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,
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?
1. How do we use water at home? 2. Can we live without water? 3. Is there enough water on the earth? 4. Why must we save water? 相关知识点: 试题来源: 解析 1. 我们在家中使用水进行饮用、烹饪、清洁、洗澡、冲厕所、浇花等。 2. 不能,水是生命之源,对所有生物来说都是必不可...
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...
How does the water cycle help the Earth? Water Around the Earth: The water cycle is also called the hydrologic cycle, and is a natural process that allows water to circulate from the earth into the atmosphere and then back to the earth. It is a continuous process that is driven by solar...
A. have betterB. had betterC. has betterWe live ___ the earth ___ many animals.A. in; withB. on; withC. on; and 相关知识点: 试题来源: 解析 A;A;A;B;B 1. How do we save water? - 主句为疑问句结构,主语为"we",助动词选复数形式"A. do";"B. does"用于第三人称单数;"C...
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...
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?
Although about 70 percent of the earths surface is covered with water,there are many places in the world still running out of water.So we should protect our water on earth. I have some suggestions: we can recycle washing clothes to water the plants or flush the toilet water; when we wash...
How much water is under the Earth's crust? How much water is in the Earth's crust? How deep is an artesian well? How deep is the Floridan Aquifer? What does gravity have to do with groundwater? How much water is in the Central Valley Aquifer?