Page 148 - Health, Population and Environment Education 9

should be emphasized and resources should be saved for future generation as well. If we
save the earth, we all remain safe in it but if it is destroyed, our future will be at risk.

Important principles of caring the earth
i. Principle of conservation of biodiversity
ii. Principle of rational use of natural resources and sustainable development

iii. Principle of conversational utilization of renewable resource and conservation of
non-renewable resources.

iv. Principle of utilization of alternative sources of energy
v. Principle of concept of reducing the risks of human life through the conservation of
the earth.

Earth as a living planet

The earth is the only living planet in the solar system. Location, temperature, climate,
season change, rotation and revolution are some of the features of the earth. Temperature
is pleasant and environment is favorable on the earth as it is located around 15 crore
kilometer away from the sun. It means the distance of the earth from the sun is neither too
close nor too far. Suitable temperature, favourable climate, availability of water resources,
greenery and other resources are reasons for why the earth is human inhabited planet.
The earth is composed of various abiotic and biotic components and each component is
the constituent of the natural environment. If any one of the components is harmed, the
whole ecosystem will be in imbalance.
The earth is the common habitat of all the living creatures. Each creature has its own role
and importance to maintain in ecosystem. So, each creature should be protected. The
creatures from microorganism to big creatures equally contribute to conserve nature and
maintain balance in ecosystem. Destruction of resources and pollution of environment
should be stopped. The earth should be maintained a safe and common habitat for all the
creatures found in the nature.

Some of the special features of the earth are as follows:

Natural structure of land
3 1
Around of the total area of the earth is occupied by the water bodies and remaining
4
4
parts is of the land. The surface of the earth is not even. It is different in different places.
Highlands, lowlands, valleys, mountain, and plain land are various natural forms of land.
Climate, natural environment and biodiversity are different in different land forms.

Air
The earth has been surrounded by a layer of air which is called atmosphere. It is composed
up of various gases. Nitrogen, oxygen, carbon dioxide, hydrogen, water vapour, dust
particles and so on. Oxygen is needed by animals for breathing. Ozone layer protects the
148 GREEN Environment Population and Health Education Book-9