Discussion
Match the following :
| I | II |
|---|---|
| (a) A zone in the water column where the vertical change of salinity is relatively sharp | (i) Flocculation |
| (b) A zone having a marked change in water density as a function of water depth | (ii) Brine |
| (c) Water having much higher salinity than normal water | (iii) Pycnocline |
| (d) A physio-chemical process whereby clay particles in seawater aggregate into a clump or cluster | (iv) Halocline |
Answer: D
The correct matching is (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i).
- A layer where salinity changes sharply with depth is the halocline.
- A layer where density changes sharply with depth is the pycnocline.
- Water much saltier than normal seawater is brine.
- Clay particles clumping together in seawater is flocculation, which happens where river water meets the sea and the salts neutralise the particles' charges.
Options A and B start by matching the salinity layer to flocculation, and option C to brine; each confuses a water layer with a substance or a process.
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