D. When planetesimals accumulate to form planets, they inevitably contain gaseous as well as heavy elements. 正确答案:B 显示答案 进入答题 问题反馈收藏题目 译文 Elements of Life [#paragraph1][#insert1]The creation of life requires a set of chemical elements for making the [#highlight1]compone...
The term surface refers to any layer of an atmosphere that is near enough to the surface of a planet to be affected by the planet's surface. For example, the Earth's surface, the surface of the Moon and the Martian surface are all called surfaces even though they are not made of...
Venus and Earth are commonly regarded as twin planets but not identical twins. They are about the same size, are composed of roughly the same mix of materials, and may have been comparably endowed at their beginning with carbon dioxide and water. However, the twins evolved differently largely ...
planets is insufficient for humans to breathe,A A. The use of robots in space exploration making it necessary to wear a space suit and oxygen equipment. The temperatures on these surfaces are costs more than the use of humans.much too hot or much too cold for any humans to B. It i...
Why does the earth have life while the other planets(行星) don't? For one thing, the earth has just the righttemperature. As the third planet from the sun, the earthseems to be just the right distance away. The planetswhich are closer to the sun are so hot because theirsurfaces are ...
In fact, water probably once dominated the Venusian atmosphere. Venus and Earth are similar in size and mass, so Venusian volcanoes may well have outgassed as much water vapor as on Earth, and both planets would have had about the same number of comets strike their surfaces. Studies of how...
D. When planetesimals accumulate to form planets, they inevitably contain gaseous as well as heavy elements. 你的答案: 正确答案:B 题目解析: 登录 后才能查看题目解析,还没有账号? 马上注册 推荐文章: 【托福阅读】Official 37-P3 美国的现代建筑 【托福阅读】Official 36-P3 工业黑变病:以桦尺蠖为...
The dwarf planets are a dry well as far as survivability goes. They’re too small to hold an atmosphere or have warm cores (as far as we know). So,Ceres,Pluto,Sedna,Xena(and its moon Gabriel), and all the rest would be great places to mummify creatures in a hurr...
Conversely, the solution of a problem in algebra, such as finding the roots of an equation or system of equations, can be estimated or sometimes given exactly by geometric means, e.g., plotting curves and surfaces and determining points of intersection. In plane analytic geometry a line is ...
(about 4 billion years ago), each body should have received at least some organic molecules.However, these molecules tend to be destroyed by solar radiation on surfaces unprotected by atmospheres.Moreover, while these molecules might stay intact beneath the surface (as they evidently do on ...