Which one of the following is correctly matched?

The correct answer is option 1.

Key Points

• Pycnocline - Sea water density (Correct)
  • The pycnocline is a layer in the ocean where water density changes rapidly with depth.
  • It is influenced by both temperature (thermocline) and salinity (halocline) variations. Hence, option 1 is correct.
• Thermocline - Air temperature (Incorrect)
  • A thermocline is a layer in a body of water (not air) where temperature changes rapidly with depth.
  • It separates warmer surface waters from colder deep waters.
• Ecocline - Biodiversity (Incorrect)
  • An ecocline is a gradual transition between two ecosystems or ecological communities.
  • It does not directly refer to biodiversity.
• Halocline - Sea water temperature (Incorrect)
  • A halocline is a layer in the ocean where salinity changes rapidly with depth.
  • It does not refer to temperature.