Question

which of the following is the main cause of seasonal changes on earth?
a the earths rotation on its axis.
b the tilt of earths axis of rotation.
c the earths orbit sometimes brings it closer to the sun.

Explanation:

• Option a: Earth's rotation on its axis causes day and night, not seasons.
• Option b: The tilt of Earth's axis (about 23.5°) means different hemispheres receive varying amounts of solar energy throughout the year, leading to seasons.
• Option c: Earth's orbit is nearly circular, and the distance change from the Sun is not the main cause of seasons (e.g., Earth is closest to the Sun in January, when it's winter in the Northern Hemisphere).

Answer:

b. The tilt of Earth's axis of rotation.