Class 7 Science - BIHAR
Earth, Moon and the Sun
The chapter 'Earth, Moon and the Sun' for Class 7 Bihar Board science introduces students to the fascinating celestial dance of our solar system. Learners explore the movements of the Earth and Moon, understanding how Earth's rotation causes day and night, while its revolution around the Sun leads to changing seasons. The chapter also covers the phases of the Moon, solar and lunar eclipses, and the concept of gravity. This is a high-scoring and fundamentally important topic for board exams, frequently featuring in both objective and short-answer questions, helping students build a strong base in astronomy.
Start Learning FreeKey Concepts
Rotation of the Earth
The spinning of the Earth on its own tilted axis from west to east, which takes 24 hours and causes day and night.
Revolution of the Earth
The movement of the Earth in a fixed elliptical orbit around the Sun, taking 365 and 1/4 days to complete one year and causing seasons.
Phases of the Moon
The different shapes of the illuminated side of the Moon as seen from Earth, changing from a new moon to a full moon over a cycle of about 29.5 days.
Solar Eclipse
A natural phenomenon that occurs when the Moon comes directly between the Sun and the Earth, casting a shadow on the Earth.
Lunar Eclipse
A phenomenon that occurs when the Earth comes directly between the Sun and the Moon, blocking sunlight from reaching the Moon.
Important Formulas
Board Exam Info
In the Bihar Board Class 7 Science exams, this chapter generally carries around 6 to 8 marks. Questions usually include multiple-choice questions (MCQs), fill in the blanks, and short answer questions explaining eclipses, day-night formation, or the phases of the moon.
Frequently Asked Questions
Why do we experience different seasons on Earth?
Seasons are caused by the tilt of the Earth's axis combined with its revolution around the Sun, which changes the angle and duration of sunlight received by different hemispheres.
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. In a lunar eclipse, the Earth blocks sunlight from reaching the Moon.
Why do we always see only one side of the Moon from Earth?
The Moon rotates on its own axis at the exact same speed that it revolves around the Earth, a phenomenon known as synchronous rotation.
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