Class 7 Science - PUNJAB
Earth, Moon and the Sun
This chapter explores the fascinating relationship between the Earth, Moon, and Sun, which forms the basis of our daily and yearly cycles. Class 7 students under the Punjab (PSEB) curriculum will learn about celestial bodies, the movements of the Earth and Moon, the phases of the Moon, and how solar and lunar eclipses occur. Understanding these cosmic phenomena is essential not only for scoring well in your board exams but also for understanding natural occurrences like tides, day and night, and seasonal changes that affect life on Earth.
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 and causes day and night.
Revolution of the Earth
The movement of the Earth around the Sun in a fixed elliptical orbit, which takes 365 and 1/4 days and causes changes in seasons.
Phases of the Moon
The changing shapes of the bright part of the Moon as seen from Earth, caused by its revolution around the Earth and changing positions relative to the Sun.
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, casting its shadow on the Moon.
Important Formulas
Board Exam Info
In Punjab (PSEB) Class 7 Science examinations, this chapter typically carries around 6 to 8 marks. Questions usually include fill-in-the-blanks, true/false, short-answer questions explaining eclipses or moon phases, and diagram-based questions asking students to sketch a solar or lunar eclipse.
Frequently Asked Questions
Why do we always see only one side of the Moon from Earth?
The Moon takes the same amount of time to complete one rotation on its axis as it does to complete one revolution around the Earth (synchronous rotation).
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 does the Moon change its shape every night?
The Moon does not produce its own light; we only see the part of the Moon that is lit by the Sun as it orbits around the Earth.
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