- An example of a physical cycle is the water cycle
- The sun is the source of energy for physical cycles on earth
- Therefore, the sun is the source of energy for water cycle on earth

- The sun is the source of energy for water cycle on earth
- Evaporation is a stage in the water cycle process
- Precipitation is a stage in the water cycle process
- Hence, the sun is the source of energy for evaporation and precipitation in the water cycle on earth

Hence, the sun is the source of energy for evaporation and precipitation in the water cycle on earth
Q: Water evaporates and falls back to Earth as rain or snow. What is the primary energy source that drives this cycle?
Context:
- An example of a physical cycle is the water cycle 
- The sun is the source of energy for physical cycles on earth 
- Evaporation is a stage in the water cycle process 
- Precipitation is a stage in the water cycle process