How does the population growth rate affect how long earth's coal supply will last? a. the coal supply lasts the longest when the population growth rate is high. b. the coal supply is used up the slowest when the population growth rate is average. c. the coal supply is used up the fastest when there is low population growth. d. the coal supply lasts the longest when there is no population growth.

The correct answer is option D.The coal supply lasts the longest when there is no population growth.

As we know that coal reserves are non renewable resources. The formation of coal reserves took million of years. So once they are used up they will never ever be available again. The more is the population, the more will be the requirement of energy resources like coal reserves to sustain such large population. So, high population will tend to use more and more coal to meet daily energy requirement. But if there is no population growth, that time only existing population which is fixed & comparatively less will use the coal resources and therefore, the coal supply will last for a longer time.

a. as the temperature increases, the kinetic energy of the gas molecules increases & the molecules move faster & further away from each other.

b. if you decrease the temperature of a fixed amount of gas at constant pressure, the combined gas law reduces to charles's law. in this case, volume will also decrease.