Question

why do europe and north america experience 4 seasons in a year

Answer 1

Some countries experience 4 seasons because the earth is tilted at an angle on its own axis.Because of the earth moving round the sun during the year,different part of earth would be tilted away from the sun.Hence,some parts of the earth nearer to the colder region would have winter and some parts of the earth nearer to the warmer region would have summer.But,Singapore is located at the equater(centre of the earth)that is why there is no summer or winter.