Class 7 Science - KERALA
Earth, Moon and the Sun
The chapter 'Earth, Moon and the Sun' in Class 7 Science for Kerala SCERT explores the fascinating cosmic relationship between our planet and its two primary celestial neighbours. Students learn about the rotation and revolution of the Earth, the causes of day and night, and the changing seasons. The chapter also covers the moon's phases, solar and lunar eclipses, and tides. This fundamental chapter is crucial for board exams as it builds the base for geography and astronomy concepts in higher classes, frequently featuring in both objective and descriptive question formats.
Start Learning FreeKey Concepts
Rotation of the Earth
The spinning of the Earth on its own 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 an elliptical orbit, which takes 365 and 1/4 days and causes 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.
Solar Eclipse
A phenomenon that occurs when the Moon comes directly between the Sun and the Earth, blocking sunlight from reaching parts of the Earth.
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
This chapter typically carries around 6 to 8 marks in the Kerala SCERT Class 7 Science examinations. Common question types include diagram-based questions (drawing solar and lunar eclipses), differences between rotation and revolution, and short descriptive answers explaining phases of the moon and seasons.
Frequently Asked Questions
Seasons are caused by the tilt of the Earth's axis combined with its revolution around the Sun, which changes the angle at which sunlight strikes different parts of the Earth throughout the year.
Seasons are caused by the tilt of the Earth's axis along with its revolution around the Sun, which changes the directness and duration of sunlight reaching different hemispheres over the year.
What is the difference between a solar eclipse and a lunar eclipse?
In a solar eclipse, the Moon is between the Sun and Earth (blocking the Sun). In a lunar eclipse, the Earth is between the Sun and Moon (casting a shadow on the Moon).
Why do we always see only one side of the Moon?
The Moon's rotational period on its axis is almost the same as its revolution period around the Earth (about 27.3 days), meaning the same side always faces the Earth.
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