A. oxygen (氧气) B. carbon dioxide (二氧化碳) C. nitrogen (氮气) D. hydrogen (氢气) 相关知识点: 试题来源: 解析 C 正确答案:C 解析:大气的主要成分是氮气(nitrogen)哦,大概占大气总成分的78%左右, 而氧气(oxygen)只占20%左右,剩余的2%由二氧化碳(carbon dioxide)等其他气体组成。反馈 收藏 ...
Plants also naturally release carbon dioxide through the process of respirafion.而土壤未被提及过。 结果三 题目 Carbon dioxide makes up less than one percent of the Earth’s atmosphere. But the gas is very important to life on Earth. Scientists are finding that processes involving carbon dioxide...
carbon (C), nonmetallicchemical elementin Group 14 (IVa) of theperiodic table. Although widely distributed in nature, carbon is not particularly plentiful—it makes up only about 0.025 percent ofEarth’scrust—yet it forms morecompoundsthan all the other elementscombined. In 1961 theisotopecarbon...
Ignitedmagnesiumcontinues to burn in carbon dioxide, but the gas does not support the combustion of most materials. Prolonged exposure of humans to concentrations of 5 percent carbon dioxide may cause unconsciousness and death. The Editors of Encyclopaedia Britannica ...
The WMO's bulletin released in November said that last year global carbon dioxide concentrations are 50 percent higher than pre-industrial levels. However, the growth rate was slightly lower than the average of both the previous year and the past decade. ...
“Embodied carbon accounts for 75 to 95 percent of the greenhouse gas emissions from landscape architecture projects,” said Chris Hardy, ASLA, PLA, senior associate at Sasaki, during the third in a series of webinars organized by the ASLA Biodiversity and Climate Action Committee. But by select...
International programs such as the "4 per 1000" Initiative, which aims to increase SOC by 0.4 percent annually, should also consider the critical role of inorganic carbon in achieving sustainable soil management and climate mitigation goals.
In recent years, the potential value of forests as a “natural climate solution” has received a great deal of attention. Forests remove carbon dioxide from the atmosphere and store carbon as organic matter in wood and soil. They also provide an important renewable resource that can replace the...
Experts said that freight and shipping are growing and a business-as-usual scenario could see shipping contribute 10 percent to global carbon dioxide emissions by 2050. De Jong said that the introduction of carbon neutral ships should start by 2030 to be aligned with the Paris climate targets th...
Less than 5 percent of the variables are missing values. The Stata command of ipolate was used for interpolation. Appendix C presents descriptive statistics. The variables of governance (gov), education (educ), and infrastructure (infra) take negative values since we used principal component ...