Question

Having been here on Earth for a while, you know that every year is made up of four seasons. What is the primary cause of the change from season to season?
A The tilt of the earth on its axis.
B The heating and cooling of the sun.
C The rotation of the earth on its axis.
D The change in distance from the earth to the sun during different seasons.

Answer 1

A — The tilt of the Earth on its axis. The 23.5° tilt causes different hemispheres to receive more direct sunlight at different times of year, producing the seasons. Rotation gives day/night, the Sun’s output is essentially constant, and distance changes are too small to cause seasons.