How are the seasons caused by parallelism?

Answer 1

The axis always remains parallel to the previous position as Earth revolves around the sun; the axis always points in the same direction. Since this is true, you cans see that during its revolution, the direct sunlight hits at different points of the Earth. If the axis pointed in random directions all the time, direct sunlight wouldn't hit in the same spot at the same time every year, thus there would be no seasons. This would also mean that if at some point the axis was pointed directly at the sun, the North Pole would be receiving extreme amounts of heat, and the ice would melt. At the same time, the South Pole would be receiving very little direct sunlight, creating severely cold temperatures.