Question

What are the causes of ocean currents?
(A) Density difference in water
(B) Effect of winds
(C) Temperature and salinity variation
(D) Gravity
(E) All of these

Answer 1

Hint: An ocean the main body of water comprising much of the hydrosphere of a planet. The ocean is one of the major conventional divisions of the World Ocean on Earth. The oceans are the Pacific, Atlantic, Indian, Southern (Antarctic), and Arctic Oceans, in descending order by area.

Complete answer:
An ocean current is a continuous directed movement of sea water produced by a number of forces that act on the water, including wind, the effect of Coriolis, breaking waves, cabbeling, and differences in temperature and salinity. Deep shoreline contours and interactions with other currents affect the direction and strength of a current. Ocean currents are mainly horizontal movements of the water. For great distances, an ocean current flows and together they create the global conveyor belt. Ocean current plays a dominant role in determining the climate of many regions of the Earth. The movement of ocean waters or ocean currents takes place due to the impact of the rotation of the earth, the difference in wind, salinity and seawater density, etc. Due to the combined effect of all these variables acting internally as well as externally, the current in the ocean originates. Gravity causes the denser water to drop, pushing the less dense water away, which shoots and rises sideways. As the lighter regions of water rise and flow to replace the heavier regions of water, giant convection loops of ocean currents are formed.

So, option E is the correct option.

Note: In the study of marine debris, ocean currents are important. Throughout the world, ocean currents also influence temperatures. Cold ocean current flows from polar and subpolar regions bring in plenty of plankton that is critical in marine ecosystems for the continued survival of several key sea creature species.