Water cycle does not involve which of the following?  

Rainwater harvesting 

The correct answer is option 4. Rainwater harvesting.

Out of the listed options, rainwater harvesting is not directly involved in the natural water cycle.

Here's why:

Evaporation, condensation, and formation of clouds are fundamental steps in the natural water cycle. Evaporation involves water transforming from a liquid state to a vapor state, rising into the atmosphere. Condensation involves water vapor cooling and changing back into liquid droplets, forming clouds. These clouds eventually release the water back to Earth's surface through precipitation (rain, snow, etc.).

Rainwater harvesting is a human-made process that collects and stores rainwater for later use. While it utilizes water that has already gone through the natural water cycle (precipitation), it doesn't directly influence the natural cycle itself. The collected rainwater is not directly returned to the atmosphere through evaporation and doesn't participate in the natural circulation of water.

Therefore, while rainwater harvesting plays a crucial role in water conservation and management, it's not considered part of the natural water cycle, which focuses on the continuous movement of water within the Earth's atmosphere and landmasses.