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1. Motions of the Earth Grade 9 Geography

2. Introduction The Earth exhibits two main motions: Rotation and Revolution. These motions influence day and night, seasons, and climatic variations.

3. Rotation of the Earth • The Earth rotates on its axis from west to east. • It takes approximately 24 hours to complete one rotation. • This causes the cycle of day and night. • The axis is tilted at 23.5 degrees, affecting time zones and seasons.

4. Revolution of the Earth • The Earth revolves around the Sun in an elliptical orbit. • It takes 365.25 days to complete one revolution. • This motion is responsible for the changing seasons. • The tilt of the Earth’s axis and its revolution lead to variations in daylight and climate.

5. Effects of Earth's Motions • Rotation causes day and night. • Revolution leads to seasonal changes. • The tilt of the Earth influences the length of day and night. • The Coriolis effect influences wind and ocean currents.

6. Summary • The two main motions of the Earth are Rotation and Revolution. • Rotation results in day and night. • Revolution causes seasonal variations. • The tilt of the Earth's axis plays a crucial role in climatic changes.