That would be the focus. The focus is indeed the point inside the earth where an earthquake takes place as well as the point inside the crust where the pressure is released. The area on the Earth's surface directly above the focus is called the epicentre.
Differences between Indus, Nile, and Yellow river valley civilizations are (please refer the attached image)
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The answer to your question is A
Answer: A) Ocean instability due to the vertical temperature profile of the top 100 meters
Explanation:
Ocean instability are due to the vertical temperature profile of the top 100 meter are not main drivers for the surface ocean current as, the surface ocean currents are derived by the velocity of the wind and the coriolis effects. Deep water current and the circulations current are driven by the changes in the salinity and the temperature which is also known as density currents.