Which energy source primarily drives the water cycle on Earth?

• A. The Sun
• B. The Moon
• C. Wind energy
• D. Geothermal energy

Answer: (A)

Verified step by step guidance

1. Understand the water cycle: The water cycle involves processes such as evaporation, condensation, precipitation, and runoff. These processes require energy to move water through different states and locations on Earth.
2. Identify the primary process in the water cycle: Evaporation is a key step where water changes from liquid to vapor. This process requires energy to overcome the forces holding water molecules together in the liquid state.
3. Determine the source of energy for evaporation: The Sun provides heat energy, which warms water bodies like oceans, lakes, and rivers, causing water molecules to gain enough energy to evaporate.
4. Eliminate other options: The Moon influences tides but does not provide energy for evaporation. Wind energy moves air but does not directly drive the water cycle. Geothermal energy is localized and does not primarily drive the global water cycle.
5. Conclude that the Sun is the primary energy source driving the water cycle, as it provides the heat necessary for evaporation and other processes in the cycle.