Enough rain couldn't have reached the earth to fill up the ocean.M: Well, did the geologists have an alternative theory to explain where ocean water came from?W: Yeah, he said the more traditional view is that the ocean water came from volcanoes.M: From volcanoes?W: Right. They say ...
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?
Comets contain water. They’re made up mostly of cosmic dust and water. When they collide with the atmosphere, they break up. And the water they contain rains down to earth. Ocean water came from that rain.W: Oh well, this morning I asked my geology professor about that. He said that...
解析 A. 1% of the world's water. 地球上的水资源主要为海水,占总水量的97%。淡水资源仅占3%,其中大部分以冰川和地下水形式存在,人类可以直接利用的淡水资源非常少。因此,人类可以直接利用的水资源比例远小于3%,选项A(1% of the world's water)最接近实际情况。
We all know that water is the source(源泉) of life on Earth.No plant,animal or human can live without it.(1) A new study(研究) shows how important drinking water is for(2) us(we) to live longer. Researchers found that people who drank a lot of water every day...
What are two ways that groundwater reaches the Earth's surface? How big is the Edwards Aquifer? How does groundwater erode rock material? What is the average depth of the ocean floor? What does groundwater descend through? How is groundwater formed?
And there you have it. An oasis is formed.正如你所见，绿洲形成了。It helps to know also that the water table can be further altered by impermeable layers in the soil, such as rocks or dense layers of clay called "hardpans".这还帮助我们了解土壤中的不透水层，例如岩石或被称为“硬质地层...
Water Water is very important for living things. Without water there can be no life on earth. All animals and plants need water. Man also needs water. Water is found atmosteverywhere. Even in the driest part of the world there is some water in the air. ...
六、阅读理解①Do 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 ...
题目 We all know that water is the source of life on Earth.No plant,insect,animal(1) orhuman can survive without it.A new study from the National Institutes of Health highlights how important it is to our health.Researchers find that people(2) who/thatdrink a l...