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Photochemical smog requires sunlight, primary pollutants (such as nitrogen oxides and volatile organic compounds), and stagnant atmospheric conditions. Sunlight initiates photochemical reactions between the pollutants, leading to the formation of secondary pollutants like ozone. The stagnant air allows these pollutants to accumulate, exacerbating smog formation. Together, these ingredients create the conditions conducive to photochemical smog.
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What is the Present form of must?
The plural form for the noun must is musts. The word must is also a verb, an auxiliary verb, and an adjective.
What must be present for metamorphism to occur?
The changes to the rock must occur in solid form.
What must be present so the clouds can form?
water vapour
What element must be present for oxide minerals to form?
Oxygen
Which two substances must be present for an iron object to rust?
For the oxidation of iron to occur, that is for ferric oxide to form, there must be oxygen present. There must also be water present.
Besides water vapor what must be present for clouds to form?
The Sun
What must be present so clouds can form?
Cool air and dust Particles
What condition must be present for carburetor ice to form?
High Relative Humidity
What must be present for igneous and sedimentary to form into metamorphic rocks?
Pressure and heat.
What must be present so that clouds could form?
Water vapor and heat must be present for clouds to form. The water is evaporated from the ground and collected into a cloud.
What is the present perfect form of the sentence 'he was ill'?
To form the present perfect tense, a past participle must be combined with the helping verbs, have, or has (present tense). In this case the verb is 'to be' and its past participle is 'been.' The answer is, "He has been ill."
What is the conditional form of all elephants have trunks?
If all elephants have trunks, then they must be present.
