Which of the factors influences ocean currents?

Wind, density difference in water masses which is caused by temp and salinity variations, gravity and an event like an earthquake.

Quizlet has the answer

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.