It all depends on how long it has been moving without that information it cannot be answered
Answer: The halocline refers to the region below the mixed layer where the salinity changes as you move deeper underwater.
Less children are being born due to increased efforts to lower the CBR (crude birth rate) and improve contraceptive methods. This results in less children being born, meaning that the older people are increasing in dependency (because there's more older people in the older generations vs the newer)
