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 ...
Air contains a certain amount of water vapor. The amount of water vapor any mass of air can contain depends on the temperature of that air: The warmer the air is, the more water it can hold. A low relative humidity means that the air is dry and could hold a lot more moisture at th...
Student: The greenhouse effect is when gases in Earth's atmosphere act like the glass in a greenhouse or a hothouse. They trap in heat which warms up the earth. Professor: Gases like? Student: Um, water vapor? Carbon dioxide? Professor: Right. Carbon dioxide. We hear a lot about carbo...
such as rivers, lakes, and oceans; groundwater that saturates the soil and rock beneath our feet; ice and snow found in polar regions and mountain peaks; and water vapor present in the atmosphere. Together, these forms of water play a key role ...
If the conditions are right, this energy creates a huge updraft into the cloud, but from where does the energy come? Clouds form when water vapor condenses in the air. This change in physical state releases heat, and heat is a form of energy. A good deal of a thunderstorm's energy ...
What equipment is used in science to measure area? What instruments are used in meteorology? What is a large body of air with the same temperature and humidity? What does 50 percent humidity mean? What is considered high and low humidity?
into a solid, without going through the liquid phase. In this sense, deposition is the opposite reaction of sublimation. Deposition usually occurs when the air touching the solid is cooler than the rest of the air. This is what happens when water vapor is transformed directly into ice as ...
What does the term 'sonic boom' mean? A sonic boom is the sound produced when an object, often today's supersonic aircraft, moves faster than the speed of sound. This rapid movement creates shock waves that manifest as a loud, booming noise. So, when you hear a sonic boom, it's oft...
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What is an aquifer in oceanography? Do sedimentary rocks have layers? What does lithosphere mean in Earth science? What is deposition in the water cycle? Which layer of the Earth contains magma? What type of boundary recycles crust into the mantle?