How do differences in water density affect the vertical mobility of ocean currents? 1. Water with high salinity is less dense than water with low…

The correct option is

2 only

Explanation

Ocean currents are influenced by various factors, including differences in water density. Density variations, primarily driven by temperature and salinity, play a crucial role in the vertical movement of ocean water, a process known as thermohaline circulation.

Statement-wise Analysis

1. Statement 1: Water with high salinity is less dense than water with low salinity.
   Incorrect. Salinity increases the density of water. Water with higher salinity contains more dissolved salts per unit volume, making it denser than water with lower salinity at the same temperature.
2. Statement 2: Cold water is denser than warm water.
   Correct. As water cools, its molecules move closer together, increasing its density. Conversely, as water warms, its molecules spread out, decreasing its density. This principle is fundamental to thermohaline circulation, where cold, dense water sinks.
3. Statement 3: Denser water tends to rise while lighter water tends to sink.
   Incorrect. This statement reverses the fundamental principle of buoyancy. Denser water tends to sink, while lighter water tends to rise. This vertical movement is a key driver of ocean currents, as denser water displaces less dense water, causing it to move upwards.

Key Takeaway

Ocean water density is primarily determined by temperature and salinity; cold, saline water is denser and tends to sink, while warm, less saline water is lighter and tends to rise.