Discussion
In a salt gradient solar pond, the salinity generally varies from top to bottom of the pond as
Answer: A
In a salt-gradient solar pond the salinity rises with depth, from under about 5% at the top to about 20% at the bottom.
The dense, very salty bottom layer absorbs sunlight and heats up, but it cannot rise because it is heavier than the layers above. The middle layer acts as a non-convecting insulating zone, which traps the heat in the bottom layer so that it can reach 70 to 80 °C. The other ranges start at a higher surface salinity, which would remove the large density contrast the pond depends on.
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