The correct answer is: Earth's axis is tilted as it revolves around the sun. This tilt causes different parts of the world to receive varying amounts of sunlight throughout the year, leading to the changes in seasons.
The correct explanation for why seasonal conditions vary in parts of the world is that Earth's axis is tilted as it revolves around the sun. This tilt causes the angle at which sunlight reaches different parts of the Earth to change throughout the year, leading to variations in the seasons. Earth's orbit also plays a role, as it keeps the Earth in line with the sun, but it is the tilt of the axis that is the main factor in the changing seasons. Additionally, Earth's rotation on its axis and its 365-day revolution around the sun are related to the concept of seasons, but they are not the direct cause of seasonal variations.
