Find out how the tilt of the Earth's axis causes the seasons. Physical processes -The Earth and beyond - Seasons Learning Points The tilt of the Earth's axis causes the seasons. The Earth can be divided into the northern and southern hemispheres. A Twig Curriculum Film. Delivering key learning points. Get straight to the facts in just three minutes – directly linked to core learning, Twig's curriculum films will fit neatly into your lesson plans.