Discuss the Issue,which Is Causing Great Concern in the United

question 121

Essay

Discuss the issue,which is causing great concern in the United States,created by a combination of two demographic trends: (1)the aging of the population (an increasing percentage of those over the age of 65);and (2)the decline in fertility rates,which leads to smaller families (parents have fewer children;sons and daughters have fewer siblings).

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Definitions:

Crude Oil Refining

The industrial process of transforming crude oil into useful petroleum products such as fuel, gasoline, and diesel.

Light Gases

Gases with low molecular weights, such as hydrogen, helium, or methane, that are often used in applications requiring low density.

Lightest Fraction

In petrochemistry, refers to the fraction of a crude oil that contains the lightest, most volatile components, such as gases and small hydrocarbons.

Volatile Components

Substances that can easily vaporize at room temperature or under mild heating, often contributing to the aroma of foods or products.