The oceans on earth will _ in one billion years.中主语 The oceans on earth,谓语 will _,will 后接动词原形,in one billion years 是将来时间,结合选项词意:A项 evaporate 蒸发,消失,B项 rise 增加,提高,C项 raise提升,举起, D项 flow 流动,流淌,涌进,依次代入句中可填 evaporate,故答案是 A。 Th...
KLA01 have presented a scheme for altering planetary orbits in the solar system, in particular that of the Earth as a means to escape (for a period) the consequences of the secular brightening of the Sun over the next few billion years. In this paper I discuss that work, present backgrou...
5 billion years ago, Mars and Earth began their existence under similar conditions. During the first billion years, liquid water-in contrast to ice-was abundant on the surface of Mars. This is an indication that Mars was much warmer during that time. Mars also had a thicker atmosphere of ...
We've studied the planet a lot, and we've realised that 3.5 to 4 billion years ago Mars had the conditions that could have supported the beginnings of life. We've found, with the Curiosity rover, which has been on Mars for 7 years now and is still investigating, that the crater it...
A fascinating thing about Earth, which may make it unique, is that all through its very long existence, all four and a half billion years, variations in the luminosity of the Sun have been compensated for by a variable greenhouse effect. It's like a sort of geophysical thermostat keeping ...
The Earth’s history has been 45 billion years. Now it can be found in different periods (时期) of different 1 of fossils, and these fossils can 2 the history of our planet earth-shaking changes. Over 200 million years ago, on Earth there 3 a group of animals: the dinosaurs. They ...
life. In our own solar system, for example, Venus is far too hot and Mars is far too cold to support life. Only the Earth provides ideal conditions, and even here it has taken more than 4 billion years for plant and animal life to ...
1完形填空The Earth's history has been 45 billion years. Nowit can be found in different periods(时期) of different1_of fossils and these fossils can 2_the history ofour planet earth-shaking changes.Over 200 million years ago, on Earth there 3 agroup of animals: the dinosaurs. They have...
One billion years from now, Earth’s atmosphere will contain very little oxygen, making it uninhabitable for complex aerobic life. Today, oxygen makes up around 21 per cent of Earth’s atmosphere. Its oxygen-rich nature is ideal for large and complex organisms, like humans, th...
”定位至第四段倒数第二句“Even though in error, Joly's calculations clearly supported those geologists who insisted on an age for Earth far in excess of a few million years.”（尽管错了，但Joly的计算明确地支持了那些坚持认为地球的年龄远远超过几百万年的地质学家的观点。）