Class 7 Science - CBSE
Earth, Moon and the Sun
The chapter 'Earth, Moon and the Sun' for Class 7 CBSE explores the fascinating cosmic dance between our planet, its natural satellite, and our star. Students will learn about the movements of the Earth and Moon, including rotation and revolution, which cause day and night and the changing seasons. The chapter also details lunar and solar eclipses, explaining the alignment of celestial bodies that create these spectacular shadows. This fundamental topic is extremely important for CBSE board exams as it tests foundational astronomy concepts, frequently featuring in diagrams, application-based questions, and multiple-choice sections.
Start Learning FreeKey Concepts
Rotation of the Earth
The spinning of the Earth on its imaginary axis from west to east, which takes 24 hours to complete 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, which results in the changing seasons.
Phases of the Moon
The changing shapes of the bright part of the Moon as seen from Earth, caused by its revolution around our planet and the varying angles of sunlight reflected off its surface.
Solar Eclipse
A phenomenon that occurs when the Moon comes directly between the Sun and the Earth, casting a shadow on the Earth and blocking sunlight.
Lunar Eclipse
A phenomenon that occurs when the Earth comes directly between the Sun and the Moon, blocking sunlight from reaching the Moon's surface.
Important Formulas
Board Exam Info
In CBSE Class 7 Science exams, this chapter typically carries around 6 to 8 marks. Common question types include diagram-based questions (drawing solar and lunar eclipses), differentiating between rotation and revolution, and short descriptive answers explaining why seasons change or why we only see one side of the Moon.
Frequently Asked Questions
Why do we experience seasons on Earth?
Seasons occur because the Earth is tilted on its axis at an angle of 23.5 degrees as it revolves around the Sun, causing different parts of the Earth to receive varying amounts of direct sunlight throughout the year.
Why do we always see only one side of the Moon?
The Moon rotates on its own axis at the exact same speed that it revolves around the Earth (synchronous rotation), which takes about 27.3 days for both movements.
What is the difference between a solar eclipse and a lunar eclipse?
In a solar eclipse, the Moon blocks the Sun from the Earth's view (Sun-Moon-Earth alignment). In a lunar eclipse, the Earth blocks sunlight from reaching the Moon (Sun-Earth-Moon alignment).
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