Which term is used in oceanography to describe the permanent or semi-permanent boundary separating surface mixed waters from the cold, deep ocean waters below?

💡 Solution & Explanation

A thermocline is a permanent or semi-permanent layer in oceans and deep lakes where water temperature drops rapidly with increasing depth, separating warm surface waters from cold deep waters. Other boundaries like haloclines denote gradients in salinity rather than temperature. Oceanographic stratification terms are frequently asked in geography and environmental science.