Earth as a System : Energy, Matter, and Life — Chapter Summary
CBSE · Class 9 · Science
Summary of Earth as a System : Energy, Matter, and Life for CBSE Class 9 Science. Part of the CBSE Class 9 Science syllabus.
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Overview
Earth functions as one connected system powered by a constant flow of energy and matter. Solar energy is the main source of energy, while Earth’s interior and chemical reactions in air, water, and rocks also contribute to system processes. The geosphere, hydrosphere, cryosphere, atmosphere, and bios
Key Concepts
Earth is made up of
Earth is made up of the geosphere, hydrosphere, cryosphere, atmosphere, and biosphere. These spheres are closely linked and constantly exchange matter
Solar radiation is the main source
Solar radiation is the main source of energy on Earth. Insolation is the amount of the Sun’s radiation that reaches Earth’s surface. The solar constan
Albedo is the fraction of solar
Albedo is the fraction of solar radiation reflected by a surface. Snow and ice have high albedo, while crushed rock, dark soil, and ocean water have l
The atmosphere is the air around
The atmosphere is the air around Earth, held by gravity. It is mainly nitrogen (78%) and oxygen (21%). The troposphere is the weather layer, and the s
The atmosphere allows sunlight to enter
The atmosphere allows sunlight to enter but traps some outgoing heat. Greenhouse gases such as carbon dioxide, methane, and water vapour keep Earth wa
Learning Objectives
- Understand Earth as a system of interacting spheres
- Explain how solar energy causes uneven heating and drives natural processes
- Describe the roles of the atmosphere in climate and life support
- Explain local winds, planetary winds, and ocean currents
- Describe the water, carbon, nitrogen, and oxygen cycles
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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