Ocean currents are caused by water's density differences. the density differences in the ocean water are due to different salt concentrations and differences in
a) waves.
b) temperature.
c) plate tectonics.
d) volcanic activity.

The arrival of in the early days of europa’s existence could have formed its ocean. it is likely that the water experienced similar to earth. it is also possible that this water is retained beneath europa’s surface and in its atmosphere due to europa’s . 1.) a. precipitation b. water vapor c. icy debris 2.) a. gravitational compression b. biochemical cycling c. radiogenic heating 3.) a, gravity b. magnetic field c. heat energy for plato