The earth's rotation on its axis causes night and day due to the face of the planet that faces the sun, creating day, while the face of the earth that meets away from the sun is night. It takes 24 hours for the planet to complete one rotation; however, it takes 12 months, 365-366 days, 8,760 hours, 525,600 minutes, and 3.154e+7 seconds in a year for the earth to complete its orbit around the sun.
The season of Spring happens when the Earth's axis tilts closer to the sun, causing the hemisphere to start warming up. This causes the new plant to begin growing.
The summer season happens when the earth's axis points directly toward the sun, which causes the planet to warm up in that area that is pointing towards the sun.
The season of autumn happens when the Earth's axis starts to tilt further away from the sun, causing the hemisphere to start cooling down. This causes the plants to begin dropping their leaves and hybernating.
The Winter season happens when the earth's axis points directly away from the sun, which causes the planet to get cold in that area that is pointing away from the sun.