The seasons on earth, change as the Earth tilted on its axis, and revolve in a loop around the Sun every year. Summer takes place when the hemisphere tilted to the Sun, whereas winter takes place tilted away from the Sun. This tilting is the primary reason for the 4 seasons of the year - summer, autumn winter and spring.
Organic compounds make up the cells and other structures of organisms and carry out life processes. Carbon is the main element in organic compounds, so carbon is essential to life on Earth. Without carbon, life as we know it could not exist.
