The rotation of the Earth is ...
It is spring or autumn when...
The revolution of the Earth is...
It is summer in the Northern hemisphere when...
It is winter in the Northern hemisphere when...
The seasons are the result of...
the Sun´s rays fall on the Equator.
its elliptical orbit around the Sun.
its movement around its own axis.
the Sun´s rays fall on the Southern hemisphere.
the tilt of the Earth and its orbit round the Sun.
the Sun´s rays fall on the Northern hemisphere.
