The document explains the process of weather cycles and seasons. It begins with a general statement introducing the topic of how seasons are caused by the Earth's rotation and tilt relative to its orbit around the sun. It then provides a series of logical steps explaining that the Earth's tilt causes the north and south poles to alternate being tilted toward the sun for half of the year each. This results in the hemisphere tilted toward the sun experiencing longer days, receiving more of the sun's rays directly, and having summer weather, while the hemisphere tilted away has winter weather. The explanation closes by stating that without the Earth's tilted axis there would be no seasons.