Sunlight cannot penetrate into the deeper oceanic zone
Explanation:
The oceans are extensively large bodies of water and are comprised of varying depth from place to place. The equatorial and the tropical region receives the maximum amount of sunlight as a result of which the ocean surface temperature rises significantly. So, the surface water up to a depth of about 200 to 300 meters below the sea level remains warm, as sunlight can easily penetrate in this zone.
But, at a depth more than about 300 meters to a depth of 1000 meters, this sunlight cannot penetrate and due to this reason the water in this zone remains cold enough. Thus, the temperature of the ocean water decreases with the increasing depth.
