Relier Pairs Planet Earth IntroVersion en ligne Introduccion de características del planeta. Movimientos del planeta y situación de las estaciones anuales. par Estibaliz Martinez 1 It is summer in the Northern hemisphere when... 2 The revolution of the Earth is... 3 It is spring or autumn when... 4 The rotation of the Earth is ... 5 The seasons are the result of... 6 It is winter in the Northern hemisphere when... the Sun´s rays fall on the Southern hemisphere. the Sun´s rays fall on the Northern hemisphere. the Sun´s rays fall on the Equator. its elliptical orbit around the Sun. the tilt of the Earth and its orbit round the Sun. its movement around its own axis.