Question

What did you observe in your investigation, and what does this tell you about the sun’s role in the water cycle?

Answer 1

Observations from the investigation
- Water in the sunlight warmed up faster than water kept in the shade.
- The water level (or mass) in the sunlight decreased faster — i.e., evaporation was quicker in the sun-exposed sample.
- Condensation formed on the cooler surfaces (lid or jar walls) when warm, moist air touched them.
- A plant or wet surface in sunlight showed more visible moisture loss (transpiration/evaporation) than the same plant in lower light.
- When warm, moist air rose and cooled, droplets formed (simulated precipitation in a closed jar).

What this tells you about the Sun’s role in the water cycle
- The Sun is the primary energy source that drives the water cycle. Its radiation warms water surfaces and air, increasing the rate of evaporation and transpiration.
- Warmer air can hold more water vapor, so solar heating increases atmospheric moisture. When that moist air cools (by rising, moving to cooler regions, or contacting cooler surfaces), the vapor condenses to form clouds and droplets, leading eventually to precipitation.
- Solar heating also creates temperature differences that drive air movement (winds) and large-scale atmospheric circulation, which transport water vapor around the globe and cause weather systems.
- In short: the Sun supplies the energy that turns liquid water into vapor, keeps water moving through evaporation, transport, condensation, and precipitation, and thus powers the entire water cycle.

If you want, I can help you write a short conclusion for a lab report or suggest improvements to the investigation (controls, measurements to quantify evaporation rate, etc.).