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Note on Earth as A Living Planet

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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:

Water

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.

Air

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.

Food Materials

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.

Seasonal change

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.

Recycling

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.

  • There are different kinds of living creatures on the earth because of distinct geographical structures and climate.
  • Water, structure of land, heat, light, air , food, season change, and recycle are important characteristics of earth.
  • The cycling of the gases like nitrogen, carbon dioxide in the atmosphere and nutrients and minerals in the soil are the examples of recycle.
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Very Short Questions

The major characteristics of the earth are as follows:

  • Structure of the land
  • Air
  • Season change
  • Heat and light
  • Food stuff
  • Recycling

Earth revolves around the sun in its own orbit. This revolution of earth causes change in season. This also depends on the light which comes from the sun. The characteristics of season differ in climate, day and night, temperature, rain fall pattern, flow of wind etc. Therefore, different types of weather can be felt in different time. Various kinds of creatures are surrounding on the earth. Seasonal variation creates the appropriate environment for the existence of biodiversity.

Earth has distinct features like temperature, rotation and revolution, climate. It is about 15 kilometer far from the sun. Earth is the large habitat for all living beings. Earth provides air, water, food, shelter etc. to the living beings. Earth has lithosphere. The suitable environment for oxygen gas in the temperature, rainfall, storms, forest etc. go on in this earth. Water covers about 71% of earth surface which moisturizes the earth, so that different kinds of plants can grow and develop on the surface of the earth. Earth is only planet capable of creating food chain. Thus, the earth is favorable place for living beings.

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  • The layer of the water in the earth is called ______.

    ionosphere
    biosphere
    mesosphere
    hydrosphere 
  • How much percentage of the total mass of the ocean consists of salt?

    0.04% 
    0.35%
    0.07%
    0.06%
  • The surface of land on the earth is called ______.

    mesosphere
    ionosphere
    lithosphere
    hydrosphere
  • How many part of the total area is occupied by lithosphere?

    thirty percent of the total area
    tenth percent of the total area
    twenth percent of the total area
    twenty nine percent of the total area
  • The layer of the air that surrounds the earth is called ______.

    hydrosphere
    ionosphere
    biosphere
    atmosphere
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Nigaha

Carrying capacity of different areas of the earth is different. Justify with examples.


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