Answer: B
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The least developed nations tend to have lower levels of industrial activity, resulting in lower levels of environmental damage. The most developed countries have found ways of improving technology and energy efficiency to reduce their environmental impact while retaining high levels of production
A thermocline is a transition layer between warmer water at the surface of a body of water and the cooler deep water that lies below. It is caused by the effect of the sun on the water, in that it keeps the upper parts of the body of water warm whilst being unable to reach the lower, deeper parts.
