Why do North and South America experience opposite seasons?

Answer 1

The tilt of earth's axis causes the two hemispheres (north and south) to be more exposed to the warmth of the sun at opposite times of the year. When it's summer in North America, it's because North America tilted towards the sun, and is therefore exposed to more daylight (and thus the sun's warmth). And when the northern hemisphere is exposed to more sunlight, the Southern Hemisphere is, of course, exposed to less, and therefore they experience winter.