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FAQs on Textbook: Movements of the Earth and planets - Natural Science and Technology (Grade 6-B)

1. What are the main movements of the Earth?
Ans.The Earth has three main movements: rotation, revolution, and precession. Rotation is the spinning of the Earth on its axis, which takes about 24 hours and causes day and night. Revolution is the movement of the Earth around the Sun, taking about 365.25 days to complete one orbit, which defines a year. Precession is the slow change in the direction of the Earth's axis, which occurs over a period of about 26,000 years.
2. How does the rotation of the Earth affect our daily lives?
Ans.The rotation of the Earth affects our daily lives by creating the cycle of day and night. As the Earth rotates, different parts of the planet are exposed to sunlight, resulting in daytime, while the parts facing away from the Sun experience night. This rotation also influences weather patterns and helps maintain the Earth's climate.
3. What is the difference between rotation and revolution?
Ans.Rotation refers to the spinning of the Earth on its own axis, leading to the cycle of day and night, while revolution is the movement of the Earth around the Sun in an elliptical orbit, which takes one year. Essentially, rotation is about the Earth's daily cycle, while revolution relates to the yearly cycle.
4. Why do we have seasons on Earth?
Ans.Seasons occur due to the tilt of the Earth's axis as it revolves around the Sun. When one hemisphere is tilted toward the Sun, it experiences summer, while the opposite hemisphere, tilted away, experiences winter. As the Earth continues its revolution, the tilt causes the seasons to change every few months.
5. What is precession, and why is it important?
Ans.Precession is the gradual change in the orientation of the Earth's rotational axis. This movement is important because it affects the position of the stars in the sky over long periods, influences climate patterns, and plays a role in the timing of seasons over thousands of years.
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