Answer:
A barometer is an instrument used to measure air pressure and track weather systems. The most common unit of measurement used in barometers is the millibar (mb).
Explanation:
The answer is A hopefully this help you
Decrease the temperature of the oxygen because if coal goes air born it can explode and wipe out power plants like they were not there
Answer:

<h2>10.5 gram(cm)^-3 is the right answer.</h2>