Class 7th

Social Science

Lesson 1 (Geography)Our Environment

What is EnvironmentEnvironment is the place, people,

things and nature that surround any living organism. It is our basic life support system. It provides the air we breath, the water we drink, the food we eat and the land where we live. It is a combination of natural & human made phenomena.

Components of Environment

Components of Environment

Natural Environment• The natural environment

refers to both Biotic(plants and animals) and A biotic conditions existing on the earth. Its consists of Lithosphere, Hydrosphere, Atmosphere and Biosphere.

Human Environment• The human

environment refers to the activities, creation and interactions among human beings

Natural Environment

The natural environment has four domains namely Lithosphere, Hydrosphere, Atmosphere and Biosphere.

Lithosphere It is the solid crust or the hard top layer of the earth. It is made up of rocks & minerals & is covered wit soil. It has various landforms such as mountains, plateaus, plains etc. It provides us land, forests, grasslands & minerals.

Hydrosphere The domain of water is known as hydrosphere. It comprises of various sources of water rivers, lakes, seas, ocean etc. It is very essential for all living organisms.

AtmosphereIt is the thin

layer of air that surrounds the earth. It protects us from the harmful rays & scorching heat of the sun. It consists of number of gases, dust & water vapours.

Biosphere Plant & animal

kingdom together make the Biosphere or the living world. It is the narrow zone of the earth where land, water and air interact with each other to support life.

Ecosystem All plants, animals & human beings depend on their immediate surroundings and are interdependent on each other. This relationship between the living organisms, as well as the relation between organism and their surroundings form an Ecosystem.

A Pond Ecosystem

Human Environment

Human beings interact with the environment and modify it according to their needs. Since time immemorial humans are modifying the natural environment. They have build dams cross rivers, factories roads etc. but a perfect balance is necessary between the human & natural environment. We must learn to live and use our environment in a harmonious way.

Thank You