MTTC Missed Topics Practice Test

Ocean currents act as a global conveyor belt of heat, moving warm water from the equator toward higher latitudes and cooler water toward the equator. This horizontal redistribution of heat shapes climate by warming some land areas and cooling others. For example, warm currents like the Gulf Stream raise temperatures on nearby land, helping keep winters milder in parts of Western Europe. Cold currents along other coasts tend to cool adjacent land and can influence rainfall patterns. While there is some vertical mixing in the ocean, the climate impact mainly comes from moving heat horizontally, not just vertically. Currents thus affect climate through heat transport, and this is why the idea that they have no climate effect or that they move heat only vertically isn’t accurate.