list and discuss the three ways that horizontal and vertical currents are created or generated.

The vertical and horizontal currents are created by wind, sea level, and variations in water pressure. When the wind blows and creates currents to develop and the current continues until friction from the seafloor drains the current's energy. By having different sea levels it will cause the different levels to fall on to each other causing waves to be formed. With different pressures it will cause pressure downwards forcing more water upwards. These ways will cause various currents to develop.