Scientists are not sure, but there has been no sign so far. 1. Which of the following is NOT the reason that the earth has life? A. The earth has just the right temperature. B. The volcanos on earth are lower than those on Mars. C. There is oxygen in the atmosphere of the ...
It is cold and dry. 以及"When we look at ancient Mars, we see a different type of surface.可知现在的火星表面和过去是不同的,故A正确。根据Whether there is life on Mars remains unanswered.可知我们仍然不知道火星上是否有生命,故B错误;根据Human beings are developing rockets and spacecraft to ...
Future settlers will not only benefit from potential water on Mars; the planet is also rich in other natural resources such as oxygen, hydrogen, and minerals, which can be well used in productive ways. For example, hydrogen can be used as fuel, and it can be combined with nitrogen (氮气...
Why is the enhanced greenhouse effect bad? What causes the greenhouse effect? Why is there no greenhouse effect on Mars? How does the greenhouse effect work? How does the greenhouse effect affect the climate? How does the greenhouse effect affect humans?
"It means that we have a resource. And when we're looking at sending humans to Mars, water is one of the key things that we need to have. Not only for the astronauts to drink, but also to make oxygen and fuel." Sending humans to Mars will be in the 2030s.Thosechosen might fly...
Scientists are not sure, but there has been no signso far.1. Which of the following is NOT the reason why theearth has life?A. The earth has just the right temperature.B. The volcanoes on the earth are lower than thoseon Mars.C. There is oxygen in the atmosphere of the earth.D....
Future settlers will not only benefit from potential water on Mars; the planet is also rich in other natural resources such as oxygen, hydrogen, and minerals, which can be well used in productive ways. For example, hydrogen can be used as fuel, and it can be combined with nitrogen ( ...
Scientists are not sure,but there has been no sign so far.52.Which of the following is NOT the reason that the earth has life?___A.The earth is just the right temperature.B.The volcanoes on earth are lower than those on Mars.C.There is oxygen in the atmosphere of the earth.D.The...
A. There is almost no oxygen in the air on Mars. B. There could have been living things on Mars. C. Mars has the largest volcano in the solar system. D. Mars is smaller and quite a bit cooler than the earth. 4.Which is the first trouble for human to live on Mars?
Mar’s atmosphere is very thin, though, so don’t think you could go there and build a house on it! You would still need a space suit and take plenty of oxygen to breathe. Because Mars has lots in common with Earth, scientists think they might be able to find traces of life on Ma...