Option B: Pycnocline- Sea water salinity
The correct answer is “Pycnocline- Sea water salinity”.
| Term | Meaning |
|---|---|
| Ecocline | A gradual change in species composition across an environmental gradient. |
| Pycnocline | A layer in the ocean where water density changes rapidly, often due to variations in salinity. |
| Thermocline | A layer in the ocean where temperature changes rapidly with depth (not air temperature). |
| Halocline | A layer in the ocean where salinity changes rapidly with depth (not sea water temperature). |