Sample Response: Sunspots are dark areas on the surface of the Sun that are cooler than surrounding areas. They appear in groups, vary in size, and cycle in number over an 11-year period. Solar flares are sudden eruptions of energy from a small area of the Sun's surface. They are extremely hot (10 to 20 million degrees Celsius) and extend into the corona. Solar flares occur near sunspots and can disturb radio communications on Earth. Which of the following did you include in your answer? Check all that apply. Sunspots are dark areas on the surface of the Sun that are cooler than surrounding areas. Sunspots appear in groups, vary in size, and cycle in number over an 11-year period. Solar flares are sudden eruptions of energy from a small area of the Sun's surface. Solar flares are extremely hot (10 to 20 million degrees Celsius) and extend into the coron Solar flares occur near sunspots and can disturb radio communications on Earth.