contestada

An extended period when temperatures are well below average is known as a/an

A. drought.
B. ice age.
C. cold wave.
D. draft.

Respuesta :

It would be a cold wave. 
Ice ages occur when the temperatures are extremely cold.(long-term)  
AL2006
Depends on the "period". If weeks, months, or years, then it's a cold wave. If centuries, then you've got yourself an ice age.