Alex DeMetrickreports it might answer an old question -- how did Mars lose its air, water and possible life? This is the way NASA thinks Mars used to look. "[About] 3.8 billion years ago, Mars was wet and warm. It was raining. It was probably snowing in the higher elevations," sai...
81. When did he plant the apple tree? 82. Where did Smith plant the apple tree in the end? 83. Why did the apple tree soon die? 84. What would probably happen if the farmer had planted the tree near his house? ...
The original question was how did Mars lose its atmosphere. I think that what happened is likely on the lines of: 1) Less iron on Mars sank to the core. Mars is enriched in surface iron.2) Photo-disassociation of water left Mars oxygen rich.3) This rusted the iron.4) Lightning react...
第2122期:How Did Human Ancestors Lose Their Tails?第2122期:How Did Human Ancestors Lose Their Tails? 2024-03-10 08:00:0004:43 1.1万 所属专辑:英语每日一听 | 每天少于5分钟 喜欢下载分享 声音简介 Our very ancient animal ancestors had tails. Why don’t we have them now? 我们非常古老的动物...
Water. At its most basic, water is a molecule with one oxygen atom and two hydrogen atoms, bonded together by shared electrons. It is a V-shaped polar molecule, which means that it's charged positively near the hydrogen atoms and negatively near the oxygen atom. Water molecules are ...
As spaceflights become more routine, astronauts don't have the celebrity power that they did during the Space Race frenzy. However, Canadian Colonel Chris Hadfield grabbed the spotlight during ISS Expedition 35 by recording music during his time in orbit. He also created a music video based on...
Exactly, and the end of the world. But, remarkably the European country of Denmark has managed to reduce its food waste by a very significant 25% Neil That’s impressive, how did that happen? Dan They attribute it to a woman cal...
A classic in soul music, this track is a high-energy appreciation song, thanking a lover for bringing joy and happiness. Its infectious groove and repetitive verses ("You didn't have to love me," "You didn't have to squeeze me," "You didn't have to hold me like you did,"...
How Mars died, despite having an atmosphere and liquid water on its surface billions of years ago? "The Death of Mars", a video by BBC Earth Lab, explains how.
2. How did the workers in the center help the raccoon? A.They changed its front paws. B.They cured it and let it live there. C.They sent it back to its home. D.They built another home just for it.3. The popcom is sold in Popcom Park Zoo to . A.treat the visitors B.reward...