Question

why is the water cycle considered a closed system on earth? water molecules are static. water is constantly recycled. water is destroyed and created. energy is neither borrowed nor returned.

Explanation:

In a closed - system, matter is neither created nor destroyed. In the water cycle, water is constantly recycled through processes like evaporation, condensation, precipitation etc. Water molecules are in motion, not static. Water is not created or destroyed in the cycle, and the question is about water, not energy.

Answer:

Water is constantly recycled.