Among the following planets, which one has a very thick atmosphere mainly composed of carbon dioxide? A. Earth B. Mars C. Venus D. Neptune 相关知识点: 试题来源: 解析 C。解析:金星有非常厚的大气层,主要由二氧化碳组成。地球的大气成分较为复杂但不是以二氧化碳为主,A错误;火星大气层很稀薄,B...
stars, planets and asteroids C. stars, gas and dust D. stars, moons and comets 相关知识点: 试题来源: 解析 C。本题考查银河星系的组成成分。银河星系主要由恒星、气体和尘埃组成,选项 A 中行星并非其主要组成部分,选项 B 中的小行星不是主要成分,选项 D 中的卫星和彗星也不是主要成分。反馈 收藏 ...
Astronomy.any of thousands of small celestial bodies that revolve about the sun in orbits chiefly between those of Mars and Jupiter ranging in diameter from one mile to 480 miles. Also calledasteroids, minor planets. —planetoidal,adj.
The Planets, Op. 32, orchestral suite consisting of seven short tone poems by English composer Gustav Holst. Its first public performance took place in 1920, and it was an instant success. Of the various movements, “Mars” and “Jupiter” are the most f
The decrease in temperature caused those substances with high melting points to condense into tiny particles that began to coalesce (join together). Such materials as iron and nickel and the elements of which the Rock-forming minerals are composed—silicon, calcium, sodium, and so forth—formed ...
The earth is composed of a number of layers: a solid crust, a semisolid mantle, and a largely molten (liquid) core that has a solid center. Basic physical features of Earth that may have made the emergence of life possible include the planets size, temperature, composition, and distance ...
The decrease in temperature caused those substances with high melting points to condense into tiny particles that began to coalesce (join together). Such materials as iron and nickel and the elements of which the rock-forming minerals are composed—silicon, calcium, sodium, and so forth—formed ...
Composed mostly of carbon dioxide (the gas represents more than 95 percent of the Martian atmosphere by volume), the atmosphere on Mars is remarkably thin and loaded with drifting dust particles. Scientists do think Mars once had a thicker atmosphere. Data from NASA's Mars Atmosphere and Volatil...
Whereas the inner planets are composed mainly of heavier elements, the Jovian planets are much larger and contain a much higher proportion of the light gases hydrogen and helium. Jupiter, with its mass of around 300 times that of Earth, is the largest planet in the solar system and is the...
39、lf; its nu merous components are comp atible with each other and with the whole. Such a harm onious structure is the outcome of a very long p eriod of trial and error years of biological evolution. The biological sector of the ecospherethe biosphere is composed of living things that...