Science 10 with CSS teacher

On the photosphere, some regions are cooler than others. These regions appear darker and are called sunspots. Sunspots vary in size, and often appear in pairs or groups. The life span of a sunspot can range from a few hours to a few months. The frequency with which sunspots appear, that is how many we can see at one time, changes. This change occurs in a cyclical manner, with a period of about 11 years. When the sunspot cycle is at its maximum, more than 100 sunspots are visible. When the cycle is at its minimum, there may be no sunspots at all. This cyclical behaviour is governed by the changing magnetic fields of the Sun.