What is an ice age?

a; a recent increase in the average global temperature near earth’s surface
b; a period of time when temperatures across the planet are colder than normal
c; a characteristic of winter that returns seasonally
d; the loss of heat in coastal areas from la niña storms

B, A time period where the earth was once colder than normal. 

Your answer is B. This is because Ice Ages are colder areas.

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We first assume that this gas is an ideal gas where it follows the ideal gas equation. the said equation is expressed as: pv = nrt. from this equation, we can predict the changes in the pressure, volume and temperature. if the volume and the temperature of this gas is doubled, then the pressure still stays the same.

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