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English prepositions are words – such as of, in, on, at, from, etc. – that function as the head of a prepositional phrase, and most characteristically license a noun phrase object (e.g., in the water). [1] Semantically, they most typically denote relations in space and time. [2] Morphologically, they are usually simple and do not inflect. [1]
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The following are single-word prepositions that take clauses as complements. Prepositions marked with an asterisk in this section can only take non-finite clauses as complements. Note that dictionaries and grammars informed by concepts from traditional grammar may categorize these conjunctive prepositions as subordinating conjunctions.
An adpositional phrase is a syntactic category that includes prepositional phrases, postpositional phrases, and circumpositional phrases. [1] Adpositional phrases contain an adposition (preposition, postposition, or circumposition) as head and usually a complement such as a noun phrase.
Air pollution can occur naturally or be caused by human activities. [4] Air pollution causes around 7 or 8 million deaths each year. [5] [6] It is a significant risk factor for a number of pollution-related diseases, including heart disease, stroke, chronic obstructive pulmonary disease (COPD), asthma and lung cancer.
Marine debris and marine aerosols refer to particulates suspended in a liquid, usually water on the Earth's surface. Particulates in water are a kind of water pollution measured as total suspended solids, a water quality measurement listed as a conventional pollutant in the U.S. Clean Water Act, a water quality law. [23]
In the context of a thermal power station and other industrial facilities, the output of the cooling system may be referred to as the effluent cooling water, which is noticeably warmer than the environment and is called thermal pollution. [9]: 375 In chemical engineering practice, effluent is the stream exiting a chemical reactor. [10]
A practical definition of water pollution is: "Water pollution is the addition of substances or energy forms that directly or indirectly alter the nature of the water body in such a manner that negatively affects its legitimate uses." [1]: 6 Water is typically referred to as polluted when it is impaired by anthropogenic contaminants.