Class 7 Geography chapter 1: Environment

Class 7 Geography Chapter 1: Environment 

🌍 Class 7 Geography Chapter 1: Environment – Detailed Notes

📘 Introduction to the Chapter: What is Environment?

Environment is everything that surrounds us. It includes living (biotic) and non-living (abiotic) components. It affects our life and is affected by our actions.

🌿 1. Components of the Environment

✅ A. Natural Environment

These are the things that occur naturally on Earth.

🔹 Major elements of Natural Environment:

  • Lithosphere – Solid crust or hard top layer of the earth.

  • Atmosphere – Thin layer of air surrounding Earth.

  • Hydrosphere – Water bodies like oceans, rivers, lakes, etc.

  • Biosphere – Life-supporting zone including all living beings and their interactions.

✅ B. Human Environment

Human-made surroundings such as buildings, parks, roads, industries, etc.

✅ C. Human-Environment Interaction

Humans modify the environment to fulfill their needs. For example:

  • Cutting forests for agriculture

  • Building houses and industries

🌦️ 2. Natural and Human-made Changes in the Environment

🔸 Natural Changes

  • Earthquakes

  • Floods

  • Volcanoes

🔸 Human-made Changes

  • Urbanization

  • Deforestation

  • Pollution

🧠 3. Importance of Environment

  • It provides air, water, food, and other resources needed for survival.

  • Balanced environment is essential for sustainable living.

💬 4. Key Terms and Definitions

TermDefinition
BioticAll living organisms in the environment
AbioticNon-living elements like air, water, land
EcosystemA community of living organisms interacting with each other and their physical environment
EcologyStudy of relationships between living beings and their surroundings

❓5. Key Questions and Answers

Q1. What is the lithosphere?

Answer: The lithosphere is the solid outer layer of the earth, made up of rocks and minerals.

Q2. Define ecosystem.

Answer: An ecosystem is a system formed by the interaction of all living organisms with each other and with the physical environment.

Q3. Mention any two man-made components of the environment.

Answer: Buildings and roads.

📝 6. Summary Points for Quick Revision

  • Environment includes both natural and man-made components.

  • Humans interact with and modify the environment.

  • The balance of the environment is essential for a healthy life.

  • The natural environment is made up of the lithosphere, atmosphere, hydrosphere, and biosphere.


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