a) The picture on the left is taken during the
spring; summer; autumn.

b) The picture on the right is taken during the
spring; summer; autumn.

c) What causes the changes in seasons?
The distance between the Sun and the Earth changes during the year.
The amount of cloud formations varies during the year.
The way in which Earth's Northern and Southern Hemispheres are tilted towards the Sun changes during the year.

Maximum: 5 points.