What Discovery by Scientists in 1985 Led to the Banning

question 97

Multiple Choice

What discovery by scientists in 1985 led to the banning of chlorofluorocarbons (CFCs) in 1987?

• A) a hole in the ozone layer over the Antarctic
• B) an unprecedented rise in the average temperature of the earth's atmosphere
• C) particulate matter levels in the air that exceeded the World Health Organization's guideline levels
• D) a causal relationship between lung cancer and chlorofluorocarbons

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Definitions:

Feedback Signal

A signal that is sent back to control a system by comparing the output with the input, thus allowing for adjustments to achieve desired performance.

Process

A continuous manufacturing operation.

SCADA System

Supervisory Control and Data Acquisition system, a computer system for gathering and analyzing real-time data to monitor and control processes.