A flow resource is a resource which is neither renewable nor non-renewable, and must be used where it occurs and replenishes itself. Flow resources can only be natural resources. Humans have no influence on the process aside from collecting the resource. Flow resources do not have the negative side effect of environmental harm. Examples of flow resources include solar radiation, running water, tides, geothermal, landfill gas, biomass, and winds. Although a flow resource has infinite flows where resources cannot be exhausted, there is no regenerative capability. Although solar energy and wind power are often referred to as renewable resources, they are appropriately known as physical resource flows.

These soils develop a reddish colour due to diffusion of iron in crystalline and metamorphic rocks. It looks yellow when it occurs in a hydrated form.
hence correct answer is A.

Solar Energy as a Flow Resource

Solar energy can be categorized as a flow resource because it is a form of renewable energy that is constantly replenished by the sun. It is a type of resource that does not deplete over time and can be utilized indefinitely. Here's a detailed explanation:

1. Flow Resource
- Flow resources are those that exist naturally and are continuously renewed or replenished by natural processes.
- They are characterized by their ability to regenerate over time and do not deplete with use.
- Examples of flow resources include sunlight, wind, water, and geothermal energy.

2. Characteristics of Solar Energy
- Solar energy is derived from the sun, which emits a vast amount of energy in the form of electromagnetic radiation.
- This energy can be harnessed using technologies like solar panels to generate electricity or provide heat for various applications.
- The sun's energy is virtually inexhaustible as it will continue to radiate energy for billions of years.

3. Renewable Nature of Solar Energy
- Solar energy is considered a renewable resource because it is constantly replenished by the sun.
- The sun's energy output is so vast that it dwarfs human energy consumption by several orders of magnitude.
- As long as the sun continues to shine, solar energy will be available for use.

4. Benefits of Solar Energy
- Solar energy offers numerous advantages, such as reducing greenhouse gas emissions, mitigating climate change, and promoting energy independence.
- It is a clean and sustainable source of energy that does not contribute to air or water pollution.
- Solar power systems can be installed on rooftops or in large-scale solar farms, providing decentralized and reliable electricity generation.

Conclusion
Solar energy is categorized as a flow resource because it is continuously replenished by the sun and does not deplete over time. Its renewable nature and numerous benefits make it an attractive option for transitioning towards a more sustainable and environmentally-friendly energy system.