Class 7 Science - HARYANA
Earth, Moon and the Sun
The chapter 'Earth, Moon and the Sun' for Class 7 Haryana Board (BSEH) students explores the fascinating celestial relationships in our solar system. Students will learn about the movements of the Earth and Moon, including rotation and revolution, which cause day and night as well as changing seasons. The chapter also details astronomical phenomena such as solar and lunar eclipses, the phases of the Moon, and the gravitational pull responsible for tides. Understanding these fundamental concepts is crucial for board exams as it forms the basis of basic astronomy and geography, frequently appearing in both objective and descriptive questions.
Start Learning FreeKey Concepts
Rotation of the Earth
The spinning of the Earth on its tilted axis from west to east, which takes 24 hours and causes day and night.
Revolution of the Earth
The movement of the Earth around the Sun in a fixed elliptical orbit, taking 365 and 1/4 days to complete one year and causing seasons.
Phases of the Moon
The changing shapes of the illuminated part of the Moon as seen from Earth, caused by its revolution around our planet.
Solar Eclipse
A phenomenon that occurs when the Moon comes directly between the Sun and the Earth, blocking sunlight and casting a shadow on Earth.
Lunar Eclipse
An event that happens when the Earth comes directly between the Sun and the Moon, blocking the Sun's light from reaching the Moon.
Important Formulas
Board Exam Info
In the Haryana (BSEH) Class 7 Science examinations, this chapter typically carries around 4 to 6 marks. Common question types include fill-in-the-blanks, true/false, short answer questions defining eclipses or phases of the moon, and diagram-based questions illustrating solar and lunar eclipses.
Frequently Asked Questions
What is the difference between rotation and revolution?
Rotation is the spinning of an object on its own axis (causing day and night), while revolution is the movement of an object around another object in an orbit (causing seasons).
Why do we always see only one side of the Moon?
The Moon takes the exact same amount of time to complete one rotation on its axis as it does to complete one revolution around the Earth (synchronous rotation).
What causes the phases of the Moon?
The phases are caused by the changing relative positions of the Earth, Sun, and Moon as the Moon orbits the Earth, changing how much of its illuminated side we can see.
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