1
Question
Why is it said that – ?
(a) The ozone layer is a protective shell of the earth.
(b) Water is life.
(c) Seawater is useful even though it is not potable.
(a) The ozone layer is a protective shell of the earth.
(b) Water is life.
(c) Seawater is useful even though it is not potable.
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Solution
a. The ozone layer acts as a protective layer for life on the earth because it absorbs harmful ultraviolet radiations of the sun. These radiations, if reach the Earth’s surface, can cause skin cancer.
b. Water is one of the most precious resource which we have on earth. All the biochemical processes which occur in plants and animals, our surroundings etc. require water to function. It is required for the existence of life on earth as it is an essential component of all the biological processes. We cannot imagine our lives without the presence of water.
c. Although sea water is not potable, it has various other kinds of uses which prove its importance:
- Water from oceans can be used for making hydroelectricity, a form of renewable source of energy.
- It can be used as a cheap transport method.
- They can be used for the activities like scuba diving, water sports etc. which is a means of boosting the tourism and economic growth of a country.
- Nuclear power plants require coolants like water to bring down the temperature of the reactors. For this purpose several gallons of water is required and this demand is fulfilled by the water from oceans.
- They support a variety of flora and fauna which have both ecological and economical value.
a. The ozone layer acts as a protective layer for life on the earth because it absorbs harmful ultraviolet radiations of the sun. These radiations, if reach the Earth’s surface, can cause skin cancer.
b. Water is one of the most precious resource which we have on earth. All the biochemical processes which occur in plants and animals, our surroundings etc. require water to function. It is required for the existence of life on earth as it is an essential component of all the biological processes. We cannot imagine our lives without the presence of water.
c. Although sea water is not potable, it has various other kinds of uses which prove its importance:
b. Water is one of the most precious resource which we have on earth. All the biochemical processes which occur in plants and animals, our surroundings etc. require water to function. It is required for the existence of life on earth as it is an essential component of all the biological processes. We cannot imagine our lives without the presence of water.
c. Although sea water is not potable, it has various other kinds of uses which prove its importance:
- Water from oceans can be used for making hydroelectricity, a form of renewable source of energy.
- It can be used as a cheap transport method.
- They can be used for the activities like scuba diving, water sports etc. which is a means of boosting the tourism and economic growth of a country.
- Nuclear power plants require coolants like water to bring down the temperature of the reactors. For this purpose several gallons of water is required and this demand is fulfilled by the water from oceans.
- They support a variety of flora and fauna which have both ecological and economical value.
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