summary of geography of class 7 ch1
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Environment Class 7 Notes Geography Chapter 1
April 18, 2019 by Sastry CBSE
Environment Class 7 Notes Social Science Geography Chapter 1 SST Pdf free download is part of Class 7 Social Science Notes for Quick Revision. Here we have given Environment Class 7 Geography Chapter 1 Notes.
Environment Class 7 Notes Social Science Geography Chapter 1
Environment
Nature, place, people, things, etc. that surround the living organisms make the environment. The environment can broadly be classified into the natural and human environment. It is a combination of both natural as well as man-made phenomena.
The natural environment comprises biotic (plants and animals) and abiotic-conditions(land, water, air, etc.), whereas the man-made phenomena comprise the activities and interactions among human beings (roads, bridges, etc.).
Natural Environment
Land, water, air, plants and animals comprise the natural environment.
Lithosphere, atmosphere, hydrosphere and biosphere are the four domains of the natural environment.
The lithosphere is the solid crust or the outermost layer of the earth where we live. It contains landforms like mountains, plateaus, plains and valleys.
The hydrosphere is the domain of water. It comprises water bodies like rivers, lakes, seas, oceans, etc.
The atmosphere is the thin layer of air that surrounds the earth. It protects us from the harmful rays and scorching heat of the sun.
The biosphere is a narrow zone of the earth where land, water and air interact with each other to support life.
What is Ecosystem?
The relation between the living organisms as well as the relation between the organisms and their surrounding form the ecosystem.
There could be an ecosystem of large rainforest, grassland, desert, mountains, lake, river, ocean and even a small pond.
Human Environment
Human beings interact with the environment and modify it according to their needs.
Early humans adapted themselves to their natural surroundings.
With time, humans learnt to grow new things, domesticate animals and lead a settled life.
The industrial revolution, transportation and information revolution made communication easier and speedy across the world.
Man is destroying the environment through deforestation, industrialisation, etc.
The environment in our basic life support system. It provides the air we breathe, the water we drink, the food we eat and the place where we live. Thus, the environment is the most important aspect of our life.
The natural environment consists of land, water, air, plants and animals. It refers to both biotic and abiotic conditions existing on the earth.