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...
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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?
【题文】 How did life come about on Earth? Did it appear in a flash of light? Well, not exactly. A study published in the journal Nature Communications in March shows that lightning may have played a significant role in the creation of life on Earth. When lightning hits sand, soil ...
58. How did lightning create more phosphorus on Earth? A A. It changed rocks into water. B. It brought phosphorus from space to Earth. C.It hit rocks with phosphorus inside. D. It created rocks that had phosphorus inside them. 59. What might scientists believe, according to Paragraph 4...
46. Some desert plants grow d___ into the earth to get water. 47. Humor is a type of language art, which brings a lot of p___ and laughter to our daily life. 48. In Beijing, people’s act of k___ makes me feel warm...
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?
There is a little water in the bottle. 6. how long 表示“多久(时间)”; 提问时间段. how often 表示 “多常; 多久一次”; 提问时间的频率. 如: They will stay in Beijing for a week. → How long will they stay in...
D How did life come about on Earth? Did it appear in a flash of light? Well, not exactly. A study published in the journal Nature Communications in March shows that lightning may have played a significant role in the creation of life on Earth.When lightning hits sand, soil or stone, ...
(三色文化:生态文明)Did you know that much1. How can we keep water clean?of the Earth is covered(覆盖) by water? Most of this A. Stopping throwing rubbish into water.is salty water in seas. People don't drink and use salty B. Using more machines to clean water.water. All lives on...