Deep water circulation is able to move up to 90% of the ocean's water and it is driven by Changes in density (temperature and salinity) Changes in the moon's gravitational pull Changes in the Ekman Spiral Changes in the Coriolis Effect

Deep water circulation, also known as thermohaline circulation, is primarily driven by changes in density, which are affected by variations in temperature and salinity. Therefore, the correct answer is:<br /><br />Changes in density (temperature and salinity)