Subject: Enviroment Population and Health
The planet earth has various kinds of qualities in comparison to various planets and satellites in the solar system. Its climate, rotation and revolution, temperature, status, etc. are the main qualities. The distance between sun and the earth is fifteen crore kilometers. It is a suitable habitat for living beings. The living beings are able to live on the earth because of these features. The earth is a large habitat for living beings. The food, air, water and shelter needed for the living beings are made available from it. Various kinds of creatures and organisms lives in different natural regions such as land, rivers, sea, forest, etc. Every region is important part of the earth. We should take earth as "Our Common Houses" So, earth is a habitat of living beings.
The earth being a huge natural habitat, there are different kinds of creatures on it. There are different birds and animals such as lion, tiger, elephant, vulture, eagle, etc. living on land. There are many aquatic animals such as fish, whale, sea horse, etc. There are also amphibians such as frog, salamander, etc. on the earth. There are different kinds of living creatures on the earth because of distinct geographical structures and climate. The earth is only the suitable planet where living creatures can survive. The earth has its own qualities with joint coordination of biosphere, lithosphere, hydrosphere and atmosphere. The existence of living beings is running due to joint adjustment of different spheres. Due to this reason, the earth has become the habitat of different living beings.
Some important characteristics are mentioned below:
The layer of the water in the earth is called hydrosphere. Hydrosphere occupies about seventy one percent of the total area of the earth. The earth's hydrosphere chiefly consist oceans, but includes all water surfaces in the world including lakes, rivers and underground waters. About 3.5% of the total mass of the ocean consists of salt. The oceans are also the reservoir of atmospheric gases, which are essential for the survival of many aquatic animals and plants. It also affects climate. It is found in the surface of the earth and on low region of the earth. Water is found in various forms such as river, lakes, ponds, rain, sea, etc. All the living organisms are depended upon water for their existence.
Structure of land
The surface of land on the earth is called lithosphere, which occupies about twenty nine of the total area. It is the important part of the earth. It is extended from surface to the inner part of the earth. The structure of land varies with altitude, wetland, topography, plain, etc. Variation in land structure creates variation in the ecosystem of a place. The plants and animals vary according to diversity of the ecosystem. This variation in the land feature has created a favorable environment for different plants, animals and microorganisms on the earth.
Heat and Light
Heat and light are obtained from the sun regularly. The plants and trees prepare their food through the process of photosynthesis with the help of sunlight. We get crops, fruits, and vegetables from plant and trees. With the means of water cycle rainfall is occurred due to solar heat. It helps the creatures to grow, develop, flower and fruit. The existence of all the creatures is established on the earth due to the light and heat.
The layer of the air that surrounds the earth is called atmosphere. Atmosphere contains various types of gases like nitrogen, oxygen, hydrogen, carbon dioxide, inert gases and dust particles. Living creatures exists in the earth due to presence of oxygen gas. The uppermost part of the atmosphere (Ozone layer) prevents the entering of harmful ultraviolet rays in the surface of the earth. It prevents global warming. Since light rays are mechanical wave, it requires medium to come up to the surface of the earth. In this case, atmosphere plays the role of mechanical wave. The heat that comes from the sun has significant role for living creatures in conducting their physical activities.
The food grains are essential for the livelihood of people and living organisms. Humans get their food from plants and animals. The plant can get food materials from the process of photosynthesis. The herbivores animals get their food from grass, plants and trees. The carnivores animals get food from other animals.
The earth rotates in its axis and revolves around the sun. Due to revolution of the earth around the sun four different seasons are created. They are spring, summer, autumn and winter. Changes in climate, day and night, change in temperature; rainfall pattern, flow of wind, snowfall, etc. are the natural process. Due to these changes different seasons are created which increase the variation in the living beings by increasing their adaptability in various environment conditions.
The cycling of the gases like nitrogen, carbon dioxide in the atmosphere and nutrients and minerals in the soil are the examples of recycle. After completing a life span all living being die and their dead bodies degrade and mix with the soil by the action of microorganisms. Form the soil, plants absorbs essential nutrients and minerals. These types of recycling of materials in the ecosystem have been important factors for the earth as a living planet.
The resources should be used properly due to limitation in bearing capacity of earth.
Carbon dioxide and nitric oxide are emitted from industries cause pollution.
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