Given a scientific question, generate a correct answer to it.

[EX Q]: What are the contacts between neurons called?
[EX A]: synapses

[EX Q]: What can be used to determine the mass of a quantity of material?
[EX A]: molar masses

[EX Q]: What is the term for a period when temperatures are cooler than normal causing glaciers to spread to lower latitudes?
[EX A]:
ice age