Which of the Following Pollutants Have NOT Decreased Dramatically Since

question 30

Multiple Choice

Which of the following pollutants have NOT decreased dramatically since the Clean Air Act was passed:

• A) lead
• B) particulates
• C) ozone
• D) all of the other specific choices have decreased
• E) none of the other specific choices have decreased

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Definitions:

Decompression Melting

The process where melting occurs in upwelling mantle material as it experiences lower pressures without a corresponding decrease in temperature, leading to magma formation.

Mantle-Derived Magmas

Magma that originates from the melting of the Earth's mantle, leading to volcanic activity.

Continental Crust

The layer of igneous, sedimentary, and metamorphic rocks that forms the continents and continental shelves, characterized by its thickness and composition distinct from oceanic crust.

Mafic Basalt

A type of basaltic rock that is rich in magnesium and iron, characterized by its dark color and low silica content.