解析 A。解析:“clouds are made of water vapor”是客观事实,宾语从句陈述客观事实用“that”引导。选项B“if”表示“是否”,不适合陈述这种客观事实;选项C“what”在从句中要充当成分,这里不需要;选项D“how”表示方式等,这里不是关于方式的内容。反馈 收藏 ...
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In what layer of the Earth's interior do primary waves travel the fastest? On which layer of the earth do tectonic plates float? Which is the lowest layer of the atmosphere? What kind of soil is in Antarctica? What is the water vapor concentration at the Earth's surface?
Depending on temperature, air can hold a fixed amount of water vapor; relative humidity is the ratio of actual vapor in the air to this fixed amount. For example, at a temperature of 68 degrees Fahrenheit (20 degrees Celsius), one cubic meter (35 cubic feet) of air can hold about 18 ...
As the air passes through the filter, it evaporates some of the water there. The higher the relative humidity, the harder it is to evaporate water from the filter, which is why a humidifier is self-regulating — as humidity increases, the humidifier's water-vapor output naturally decreases....
To be clear, a drop in CO2 wouldn't directly cause the whole drop in temperature. The biggest impact comes from the most abundant greenhouse gas, water vapor, which condenses out due to the fact that colder air holds less water vapor; this is what tanks the greenhouse effect in the simu...
In this Science 101 video, scientists Debolina Dasgupta and Nancy Kariuki describe the science, technology, and applications of hydrogen energy. Hydrogen is the simplest chemical element, or type ofatom, and an abundance of hydrogen exists within the water on our planet. It is naturally renewed ...
In cinnabar's natural mineral and pigmented form, it's not dangerous. However, when temperatures rise, it releases a mercury vapor which can be toxic if inhaled. "Mercury is toxic, but as long as the cinnabar isn't heated, the mercury is locked by the sulfur, making cinnabar low in tox...
What Is the Water Cycle?on the NASA Climate Kids website Water cycleon Wikipedia The Water Cycleon the NASA Precipitation Education website Author Recent Posts M. Özgür Nevres I am a software developer and a science enthusiast. I was graduated from the Istanbul Technical University (ITU), ...