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Many reactions that produce secondary pollutants are triggered by ________ and are called photochemical reactions.

The main source of energy for a hurricane is the _______________.

A “London-type” smog is characterized by ______________.

In order to see a rainbow, an observer must ________ the rain and ________ the Sun.

This is the most abundant primary pollutant.

Inversions represent a hazardous meteorological condition with respect to air pollution because they always bring __________.

Plate tectonics “explains” certain climatic changes by showing that these changes may be related to ___________________.

This is the most abundant primary pollutant.

The primary factor which determines whether a place will have a dry climate is _________________.

Although the polar climates generally have small precipitation totals, they are considered humid. The reason for this is _____________________.