Selina Textbook Solutions: Renewable and Non-renewable resources | Geography Class 7 ICSE PDF Download

 Page 1


Renewable and Non-renewable resources 
DISCUSS 
Discuss the ways by which you can conserve energy, especially petroleum and 
electricity, in your homes and school. What changes do you need to make in your daily 
routine to save these precious resources ? 
Answer: 
I would preferably follow all the ways mentioned in the question to conserve energy. 
1. Careful use of petroleum and electricity : One should preferably use bicycle or 
barefoot for shorter distances instead of cars. One must switch off the switches 
when lights/fans are not required. 
2. Careful use of water when washing and gardening : One should properly 
utilise the water while washing clothes and gardening. Do not keep the taps open 
and waste water. 
THINK AND ANSWER 
Hydroelectricity is considered a good energy option for the future. Why ? 
Answer: 
Hydropower is fueled by water, so it’s a clean fuel source, meaning it won’t pollute the 
air like power plants that bum fossil fuels, such as coal or natural gas. 
Hydroelectric power is a domestic source of energy, allowing each state to produce their 
own energy without being reliant on international fuel sources. 
The energy generated through hydropower relies on the water cycle, which is driven by 
the sun, making it a renewable power source, making it a more reliable and affordable 
source than fossil fuels that are rapidly being depleted. 
VALUE AND LIFE SKILL 
Electricity is very important for all of us. We need it for our homes, offices, industries 
and agriculture. 
Make a list of five different ways in which you can save electricity, for instance, 
switching off fans, ACs, light at home and in school when these thing are not required. 
Answer: 
The ways in which we can save electricity are : 
1. Using natural light whenever possible instead of using artificial light 
2. Replacing our bulb with CFL or LED bulbs. 
3. Turn off the lights wherever it is not required. 
4. By unpluging the appliances that are not in use. 
5. Replacing old appliances with new energy saving models. 
Page 2


Renewable and Non-renewable resources 
DISCUSS 
Discuss the ways by which you can conserve energy, especially petroleum and 
electricity, in your homes and school. What changes do you need to make in your daily 
routine to save these precious resources ? 
Answer: 
I would preferably follow all the ways mentioned in the question to conserve energy. 
1. Careful use of petroleum and electricity : One should preferably use bicycle or 
barefoot for shorter distances instead of cars. One must switch off the switches 
when lights/fans are not required. 
2. Careful use of water when washing and gardening : One should properly 
utilise the water while washing clothes and gardening. Do not keep the taps open 
and waste water. 
THINK AND ANSWER 
Hydroelectricity is considered a good energy option for the future. Why ? 
Answer: 
Hydropower is fueled by water, so it’s a clean fuel source, meaning it won’t pollute the 
air like power plants that bum fossil fuels, such as coal or natural gas. 
Hydroelectric power is a domestic source of energy, allowing each state to produce their 
own energy without being reliant on international fuel sources. 
The energy generated through hydropower relies on the water cycle, which is driven by 
the sun, making it a renewable power source, making it a more reliable and affordable 
source than fossil fuels that are rapidly being depleted. 
VALUE AND LIFE SKILL 
Electricity is very important for all of us. We need it for our homes, offices, industries 
and agriculture. 
Make a list of five different ways in which you can save electricity, for instance, 
switching off fans, ACs, light at home and in school when these thing are not required. 
Answer: 
The ways in which we can save electricity are : 
1. Using natural light whenever possible instead of using artificial light 
2. Replacing our bulb with CFL or LED bulbs. 
3. Turn off the lights wherever it is not required. 
4. By unpluging the appliances that are not in use. 
5. Replacing old appliances with new energy saving models. 
6. Using less air conditioner and less hot water. 
EXERCISES 
A. Fill in the blanks. 
1. Sun, water, wind are examples of renewable energy resources. 
2. Solar cells use the power supplied by the Sunlight. 
3. Geothermal energy is the heat of the earth. 
4. Coal, petroleum and natural gas are fossil fuels. 
5. Anthracite is the coal with the highest percentage of coal. 
B. Match the following. 
 
Answer: 
 
C. Choose the correct answer. 
1. Photovoltaic cells use the energy of 
1. sun 
2. wind 
3. water 
4. tides 
Page 3


Renewable and Non-renewable resources 
DISCUSS 
Discuss the ways by which you can conserve energy, especially petroleum and 
electricity, in your homes and school. What changes do you need to make in your daily 
routine to save these precious resources ? 
Answer: 
I would preferably follow all the ways mentioned in the question to conserve energy. 
1. Careful use of petroleum and electricity : One should preferably use bicycle or 
barefoot for shorter distances instead of cars. One must switch off the switches 
when lights/fans are not required. 
2. Careful use of water when washing and gardening : One should properly 
utilise the water while washing clothes and gardening. Do not keep the taps open 
and waste water. 
THINK AND ANSWER 
Hydroelectricity is considered a good energy option for the future. Why ? 
Answer: 
Hydropower is fueled by water, so it’s a clean fuel source, meaning it won’t pollute the 
air like power plants that bum fossil fuels, such as coal or natural gas. 
Hydroelectric power is a domestic source of energy, allowing each state to produce their 
own energy without being reliant on international fuel sources. 
The energy generated through hydropower relies on the water cycle, which is driven by 
the sun, making it a renewable power source, making it a more reliable and affordable 
source than fossil fuels that are rapidly being depleted. 
VALUE AND LIFE SKILL 
Electricity is very important for all of us. We need it for our homes, offices, industries 
and agriculture. 
Make a list of five different ways in which you can save electricity, for instance, 
switching off fans, ACs, light at home and in school when these thing are not required. 
Answer: 
The ways in which we can save electricity are : 
1. Using natural light whenever possible instead of using artificial light 
2. Replacing our bulb with CFL or LED bulbs. 
3. Turn off the lights wherever it is not required. 
4. By unpluging the appliances that are not in use. 
5. Replacing old appliances with new energy saving models. 
6. Using less air conditioner and less hot water. 
EXERCISES 
A. Fill in the blanks. 
1. Sun, water, wind are examples of renewable energy resources. 
2. Solar cells use the power supplied by the Sunlight. 
3. Geothermal energy is the heat of the earth. 
4. Coal, petroleum and natural gas are fossil fuels. 
5. Anthracite is the coal with the highest percentage of coal. 
B. Match the following. 
 
Answer: 
 
C. Choose the correct answer. 
1. Photovoltaic cells use the energy of 
1. sun 
2. wind 
3. water 
4. tides 
2. Hydroelectricity is obtained by using 
1. wind 
2. water 
3. coal 
4. natural gas 
3. Wind mills have been used for many centuries in 
1. the USA 
2. the Netherlands 
3. Russia 
4. India 
4. The coal that has the highest percentage of carbon is 
1. anthracite 
2. bituminous 
3. lignite 
4. peat 
5. The Bhakra-Nangal Dam is situated on the river 
1. Yamuna 
2. Beas 
3. Ravi 
4. Satluj 
D. State whether the following is True or False. 
1. Coal and petroleum are renewable energy resources. 
Answer. False. 
Correct : Coal and petroleum are non-renewable energy resources. 
2. Renewable energy resources have limited supply in nature. 
Answer. False. 
Correct : Renewable energy resources have unlimited supply in nature. 
3. China, USAand Spain are major producers ofwind energy. 
Answer. True. 
4. Coal takes millions of years to form. 
Answer. True. 
Page 4


Renewable and Non-renewable resources 
DISCUSS 
Discuss the ways by which you can conserve energy, especially petroleum and 
electricity, in your homes and school. What changes do you need to make in your daily 
routine to save these precious resources ? 
Answer: 
I would preferably follow all the ways mentioned in the question to conserve energy. 
1. Careful use of petroleum and electricity : One should preferably use bicycle or 
barefoot for shorter distances instead of cars. One must switch off the switches 
when lights/fans are not required. 
2. Careful use of water when washing and gardening : One should properly 
utilise the water while washing clothes and gardening. Do not keep the taps open 
and waste water. 
THINK AND ANSWER 
Hydroelectricity is considered a good energy option for the future. Why ? 
Answer: 
Hydropower is fueled by water, so it’s a clean fuel source, meaning it won’t pollute the 
air like power plants that bum fossil fuels, such as coal or natural gas. 
Hydroelectric power is a domestic source of energy, allowing each state to produce their 
own energy without being reliant on international fuel sources. 
The energy generated through hydropower relies on the water cycle, which is driven by 
the sun, making it a renewable power source, making it a more reliable and affordable 
source than fossil fuels that are rapidly being depleted. 
VALUE AND LIFE SKILL 
Electricity is very important for all of us. We need it for our homes, offices, industries 
and agriculture. 
Make a list of five different ways in which you can save electricity, for instance, 
switching off fans, ACs, light at home and in school when these thing are not required. 
Answer: 
The ways in which we can save electricity are : 
1. Using natural light whenever possible instead of using artificial light 
2. Replacing our bulb with CFL or LED bulbs. 
3. Turn off the lights wherever it is not required. 
4. By unpluging the appliances that are not in use. 
5. Replacing old appliances with new energy saving models. 
6. Using less air conditioner and less hot water. 
EXERCISES 
A. Fill in the blanks. 
1. Sun, water, wind are examples of renewable energy resources. 
2. Solar cells use the power supplied by the Sunlight. 
3. Geothermal energy is the heat of the earth. 
4. Coal, petroleum and natural gas are fossil fuels. 
5. Anthracite is the coal with the highest percentage of coal. 
B. Match the following. 
 
Answer: 
 
C. Choose the correct answer. 
1. Photovoltaic cells use the energy of 
1. sun 
2. wind 
3. water 
4. tides 
2. Hydroelectricity is obtained by using 
1. wind 
2. water 
3. coal 
4. natural gas 
3. Wind mills have been used for many centuries in 
1. the USA 
2. the Netherlands 
3. Russia 
4. India 
4. The coal that has the highest percentage of carbon is 
1. anthracite 
2. bituminous 
3. lignite 
4. peat 
5. The Bhakra-Nangal Dam is situated on the river 
1. Yamuna 
2. Beas 
3. Ravi 
4. Satluj 
D. State whether the following is True or False. 
1. Coal and petroleum are renewable energy resources. 
Answer. False. 
Correct : Coal and petroleum are non-renewable energy resources. 
2. Renewable energy resources have limited supply in nature. 
Answer. False. 
Correct : Renewable energy resources have unlimited supply in nature. 
3. China, USAand Spain are major producers ofwind energy. 
Answer. True. 
4. Coal takes millions of years to form. 
Answer. True. 
5. The Sardar Sarovar Dam is built on the river Narmada. 
Answer. True. 
E. Answer the following questions brief. 
Question 1. 
What are renewable energy resources? 
Answer: 
Renewable energy resources are those that come from natural sources and are 
naturally replenished. These include solar energy (sunlight), wind energy from windmill 
(wind), hydroelectricity (rain), tidal energy from waves (tides) and geothermal energy 
(energy from the heat of the earth). 
Question 2. 
What is the main difference between renewable an non-renewable energy resources? 
Answer: 
Renewable Resources 
1. These are those resources which can be renewed in a short time. 
2. These do not cause any pollution to the environment. 
3. These are the free gifts of nature. 
4. Air, water and solar energy are the examples of renewable resources. 
Non-Renewable Resources 
1. These are those resources which cannot be renewed in a short time. 
2. These cause pollution to the environment. 
3. These are not the free gifts of nature. 
4. Coal, Petroleum and some minerals are the examples of the non-renewable 
resources. 
Question 3. 
What is tidal energy ? 
Answer: 
Tidal energy is an inexhaustible source of energy. It is energy generated from ocean 
tides. High tides in coastal areas are used to generate power. Tidal energy is generated 
free of cost. 
Question 4. 
Which countries are major producers of wind power in the world? 
Answer: 
China, USA, Germany, Spain and Netherland are the leading wind power producing 
nations. 
Page 5


Renewable and Non-renewable resources 
DISCUSS 
Discuss the ways by which you can conserve energy, especially petroleum and 
electricity, in your homes and school. What changes do you need to make in your daily 
routine to save these precious resources ? 
Answer: 
I would preferably follow all the ways mentioned in the question to conserve energy. 
1. Careful use of petroleum and electricity : One should preferably use bicycle or 
barefoot for shorter distances instead of cars. One must switch off the switches 
when lights/fans are not required. 
2. Careful use of water when washing and gardening : One should properly 
utilise the water while washing clothes and gardening. Do not keep the taps open 
and waste water. 
THINK AND ANSWER 
Hydroelectricity is considered a good energy option for the future. Why ? 
Answer: 
Hydropower is fueled by water, so it’s a clean fuel source, meaning it won’t pollute the 
air like power plants that bum fossil fuels, such as coal or natural gas. 
Hydroelectric power is a domestic source of energy, allowing each state to produce their 
own energy without being reliant on international fuel sources. 
The energy generated through hydropower relies on the water cycle, which is driven by 
the sun, making it a renewable power source, making it a more reliable and affordable 
source than fossil fuels that are rapidly being depleted. 
VALUE AND LIFE SKILL 
Electricity is very important for all of us. We need it for our homes, offices, industries 
and agriculture. 
Make a list of five different ways in which you can save electricity, for instance, 
switching off fans, ACs, light at home and in school when these thing are not required. 
Answer: 
The ways in which we can save electricity are : 
1. Using natural light whenever possible instead of using artificial light 
2. Replacing our bulb with CFL or LED bulbs. 
3. Turn off the lights wherever it is not required. 
4. By unpluging the appliances that are not in use. 
5. Replacing old appliances with new energy saving models. 
6. Using less air conditioner and less hot water. 
EXERCISES 
A. Fill in the blanks. 
1. Sun, water, wind are examples of renewable energy resources. 
2. Solar cells use the power supplied by the Sunlight. 
3. Geothermal energy is the heat of the earth. 
4. Coal, petroleum and natural gas are fossil fuels. 
5. Anthracite is the coal with the highest percentage of coal. 
B. Match the following. 
 
Answer: 
 
C. Choose the correct answer. 
1. Photovoltaic cells use the energy of 
1. sun 
2. wind 
3. water 
4. tides 
2. Hydroelectricity is obtained by using 
1. wind 
2. water 
3. coal 
4. natural gas 
3. Wind mills have been used for many centuries in 
1. the USA 
2. the Netherlands 
3. Russia 
4. India 
4. The coal that has the highest percentage of carbon is 
1. anthracite 
2. bituminous 
3. lignite 
4. peat 
5. The Bhakra-Nangal Dam is situated on the river 
1. Yamuna 
2. Beas 
3. Ravi 
4. Satluj 
D. State whether the following is True or False. 
1. Coal and petroleum are renewable energy resources. 
Answer. False. 
Correct : Coal and petroleum are non-renewable energy resources. 
2. Renewable energy resources have limited supply in nature. 
Answer. False. 
Correct : Renewable energy resources have unlimited supply in nature. 
3. China, USAand Spain are major producers ofwind energy. 
Answer. True. 
4. Coal takes millions of years to form. 
Answer. True. 
5. The Sardar Sarovar Dam is built on the river Narmada. 
Answer. True. 
E. Answer the following questions brief. 
Question 1. 
What are renewable energy resources? 
Answer: 
Renewable energy resources are those that come from natural sources and are 
naturally replenished. These include solar energy (sunlight), wind energy from windmill 
(wind), hydroelectricity (rain), tidal energy from waves (tides) and geothermal energy 
(energy from the heat of the earth). 
Question 2. 
What is the main difference between renewable an non-renewable energy resources? 
Answer: 
Renewable Resources 
1. These are those resources which can be renewed in a short time. 
2. These do not cause any pollution to the environment. 
3. These are the free gifts of nature. 
4. Air, water and solar energy are the examples of renewable resources. 
Non-Renewable Resources 
1. These are those resources which cannot be renewed in a short time. 
2. These cause pollution to the environment. 
3. These are not the free gifts of nature. 
4. Coal, Petroleum and some minerals are the examples of the non-renewable 
resources. 
Question 3. 
What is tidal energy ? 
Answer: 
Tidal energy is an inexhaustible source of energy. It is energy generated from ocean 
tides. High tides in coastal areas are used to generate power. Tidal energy is generated 
free of cost. 
Question 4. 
Which countries are major producers of wind power in the world? 
Answer: 
China, USA, Germany, Spain and Netherland are the leading wind power producing 
nations. 
Question 5. 
What is biogas ? How is it useful to us ? 
Answer: 
Animal waste and all other kinds of organic waste material generated by households 
each day converted into biogas. This gas is an excellent source of cheap power for 
small-scale usage. 
Question 6. 
What are fossil fuels? 
Answer: 
Fuels formed in the geological past from the remains of living organisms and plants etc. 
Examples of fossil fuels are coal, petroleum and natural gas, etc. 
Question 7. 
Name a few major producers of petroleum in the world. 
Answer: 
The main oil-producing areas are the Gulf countries including Saudi Arabia, Iraq, Iran, 
USA, Venezuela, Algeria and Russia. 
F. Answer the following questions in one or two paragraph. 
Question 1. 
Give an account of the use of solar energy. 
Answer: 
Solar energy is the energy that we receive from the sun. It is readily available in nature 
and in unlimited quantities. 
While there are several ways to obtain solar energy, one way is by the use of solar cells 
or photovoltaic panels. These panels are made from very thin semi-conducting 
materials which, when exposed to sunlight, use the heat and light of the sun to shake 
the electrons loose and create an electric current. 
Solar cells are used for lighting street lamps, in electronic calculators, watches, smart 
phones, camera, traffic signals, water pumps and home lighting. Solar energy is being 
used to heat ovens, cook food and heat water. 
Question 2. 
How is hydroelectricity generated? 
Answer: 
The word ‘hydro’ means water and hydroelectricity is the energy obtained using water. It 
is produced when water falls from a height under the force of gravity. The falling water 
then turns the wheels of a large turbine that generate electricity.