Explanation: Occasionaly gas is shot from the surface of Sun. The reason for this is gravity-pressure instability. Most of this gas returns to the surface. Reason for this return are both magnetic field lines and gravitational pulling.
Answer A is description of a corona. It extends milions of kilometers in space and it can be seen only during solar eclipses. This is sort of Sun's atmosphere.
Answer C is description of a solar flare. It is huge explosion on the surface that sends out various types of radiation including visible light. This is similar to nuclear explosion on the Earth. On the picture this is marked with letter B.
Answer D is description of a sunspot. It occasionaly appears on the surface. The appearance follows 11 year min-max rule. It darker because it has lower temperature than the rest of surface, about 2000 degrees lower.
Number of pages that the chapter has = 8 Number of pages of the chapter that Kosta read = (1/4) * 8 = 1 * 2 = 2 The number of pages of the chapter read by Christina = 3 Then The total number of pages of the chapter read by both of them = 2 + 3 = 5 So the total number of pages of the chapter that has been read by Kosta and Christina is 5. I hope the procedure is clear enough for you to understand.
