We all know that The Earth, our planet, spins around on its own axis. It is an imaginary line passing through the North and South poles. That's how we get night and day. But why we get different seasons is more complex. The Earth isn't standing straight up at a 90 degree angle. It's more tilted on its axis that measures about 23.5 degrees. As the Earth revolves around the Sun in a wide circle, sometimes the top portion (Northern Hemisphere) is towards the Sun, and sometimes the bottom portion (Southern Hemisphere) is, due to the tilt of Earth. When the top is pointed toward the Sun, it is summer in the Northern Hemisphere and winter in the Southern Hemisphere, and vice versa. The times in between, when no end is pointed towards the Sun, then we get autumn and spring. Although not every place in the world has four seasons, or a winter and a summer as we think of it. Countries near to the equator - the line which goes round the middle of the earth - have very mild seasons. The weather stays almost the same temperature all the year round. Can you think why this is?
The middle doesn't tilt very much does it? This means the seasons don't change as much. Can you guess what the seasons are like in the North and South Pole? Because they tip further towards and further away from the sun, their seasons are very extreme. The North and South Pole only have one sunrise and one sunset a year. It is dark for six months of the year and light for six months of the year. Can u imagine living in such a place?