Question

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Answer 1

Answer:

5th question answer where the living life on the earth exist is called biosphere

Answer 2

Answers:-

4. The earth is called a watery planet because 70 per cent of its total area is covered by water. Thus, from space, it looks blue.

5. Biosphere is the narrow realm of contact and interaction between the atmosphere, lithosphere and hydrosphere. It is a thin layer of approximately 15 km from the deepest ocean trench to the highest mountain peak.

6. The conditions necessary for life on earth are:-

• Distance from the Sun- The earth is at an optimum distance from the sun. Hence, it is neither too hot not too cold.

• Temperature- The earth is the third planet from the sun. It has an average temperature of 17°C which is suitable for life to exist.

• Atmosphere- The earth's atmosphere is made up of life supporting gases like nitrogen, oxygen and carbon dioxide.

• Water- Earth is a watery planet with 70% of the earth's surface being covered by water. Water can absorb enormous amount of heat without causing much change in its temperature.

• Solid Crust (Lithosphere)- Earth has a solid crust. Soil purbodesh various nutrients necessary for growth of plants, which in turn support all forms of animal life.

• Biosphere- It provides all the necessities for all the species living on earth, i.e., light, heat, water, food and habitat.

• Life-giving Cycles- Various life-giving cycles operate in nature, balancing the factors necessary for life. These are nutrition cycle, carbon cycle, nitrogen cycle and oxygen cycle.

7. Two features of the earth that make it a 'Unique Planet' are:-

Distance from the Sun-

• The earth is at an optimum distance from the sun. Hence, it is neither too hot not too cold.

• The distance between the earth and the sun makes life possible on the earth.

Water-

• Earth is a watery planet with 70% of the earth's surface being covered by water.

• Distribution of water is responsible for moderating the climate and surface condition of the earth.

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