What do we have seasons on earth

Because the Earth's axis is not "straight up and down" as we move

around the sun.

So when we're on one side of the sun, the top pole leans slightly toward

the sun. During that time the sun shines more directly on the top half

of the Earth, and less directly on the bottom half. The people on the

top half see the sun higher in the sky, and their weather is warmer,

while the people on the bottom half see the sun lower in the sky, and

their weather is cooler.

Then, when we're on the other side of the sun, the top pole leans slightly

away from the sun. During that time the sun shines more directly on the

bottom half of the Earth, and less directly on the top half. The people on

the bottom half see the sun higher in the sky, and their weather is warmer,

while the people on the top half see the sun lower in the sky, and their

weather is cooler.

The Earth makes the complete trip around the sun in one year, so the

people on the Earth go through this cycle of higher/lower sun and

warmer/cooler weather every year.