Dark spots on the photosphere are known as

A. the corona.

B. the chromosphere.

C. sunspots.

D. solar wind.

The dark spots that are found on the photosphere are called sunspots. These are a temporary phenomena and are areas of different temperature compared to the surroundings. Sunspots are at a lower temperature compared to the surrpundings and they are created due to magnetic field flux. They can stay on from a few days to a few months and eventually decay.