Which term refers to the middle layer where temperature drops rapidly?

Which term refers to the middle layer where temperature drops rapidly?

• A. Metalimnion
• B. Epilimnion
• C. Hypolimnion
• D. Thermocline

Answer: (A)

In a stratified lake, heat from the sun warms the upper waters while the deeper waters remain cooler, creating distinct layers. The middle layer is where the temperature drops most rapidly with depth, sitting between the warm surface layer and the cool bottom layer. This zone is called the metalimnion. It often coincides with the thermocline, the region of rapid temperature change, but the layer itself is the metalimnion. So, the middle layer—where the temperature falls quickly as you go downward—is the metalimnion.

In a stratified lake, heat from the sun warms the upper waters while the deeper waters remain cooler, creating distinct layers. The middle layer is where the temperature drops most rapidly with depth, sitting between the warm surface layer and the cool bottom layer. This zone is called the metalimnion. It often coincides with the thermocline, the region of rapid temperature change, but the layer itself is the metalimnion. So, the middle layer—where the temperature falls quickly as you go downward—is the metalimnion.