The border between Mexico and the united state is 3,145 kilometers (1,954 miles).
A primary pollutant is an air pollutant emitted directly from a source.
A secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere.
Examples of a secondary pollutant include ozone, which is formed when hydrocarbons (HC) and nitrogen oxides (NOx) combine in the presence of sunlight; NO2, which is formed as NO combines with oxygen in the air; and <em><u>acid rain</u></em>, which is formed when sulfur dioxide or nitrogen oxides react with water.
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I would say that they are placed into families.
Answer:
Instructional approaches that embed biogeography can help students understand how the development, conservation, and demise of all life involves biological, geological, social, and historical processes.
Explanation:
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