We use many different energy sources to do work for us. Energy sources are classified into two groups - renewable and nonrenewable. Non-renewable energy sources are those that take millions of years to form and will run out some day. It is energy that comes from fossil fuels such as coal, crude oil, and natural gas. Fossil fuels are mainly made up of carbon and were formed millions of years ago. The chemical reaction which takes place when we burn fossil fuels releases carbon compounds such as carbon monoxide and carbon dioxide into the air. Carbon dioxide is one of the green house gases which is contributing to global warming and air pollution. On the other hand, renewable energy sources will never run out, are better for the environment and do not cause pollution. Renewable energy is often called green energy because it is a natural energy, always available and does not have to be formed like nonrenewable energy. The green energy is always there. For example, the Sun consistently shines, water is abundant, and the winds blow throughout the year. The five types include solar, energy from the Sun; geothermal, energy from heat within the Earth; hydroelectric, energy from moving water; biomass, energy from dead plants and microorganisms and finally, energy from the wind.

1. Look at the pictures, then read the text quickly. What is the main idea? Circle one of the options below.

(Nhìn vào hình ảnh, sau đó đọc văn bản một cách nhanh chóng. Ý chính là gì? Khoanh tròn một trong các tùy chọn bên dưới.)

A. Fossil fuels (Nhiên liệu hóa thạch)

B. Green sources of energy (Nguồn năng lượng xanh)

NOTHING TO LOSE

We use fossil  fuels in our daily life, but they are limited and cause pollution. A lot of scientists are working hard to look for some lossless and environmentally friendly sources of energy. 

Solar energy is not new to us because we use itto dry things every day. Solar panels catch sunrays and change them into electricity. We knowthat it is renewable because the sun never stops producing sunlight.

Wind power is also an old source of energy. Inthe past, explorers used wind for sailing their ships to distant lands. A single windmill can pump water and generate electricity. To get much more power all at once, people install lots of giant wind turbines on wind farms.

If we stop using fossil fuels, our planet will be greener. There is nothing to lose when we use solar energy or wind power.

IV.       Read and choose the correct word in the box to fill in the blank. There is an extra word. There are three major forms of fossil fuels: coal, oil and natural gas. All three were formed many hundreds of millions of years ago before the time of the dinosaurs  – (26)               , we call them fossil fuels.

Fossil fuels (27)                 millions of years to make. But they are not unlimited. We are using up the fuels that were made more than 300 million years ago. They are not (28)    _like solar power, wind power, hydro power or biomass. Once they are gone they are gone. So, it’s best not to waste fossil fuels.

We can save fossil fuels (29)              _conserving energy. One simple way to do this is to turn off appliances, TVs and radios that we are not using. We can also turn off lights when no one is in the room. Another way is to go by bike or walk instead of (26) cars or motorbikes.

There are three major forms of fossil fuels: coal, oil and natural gas. All three were formed many hundreds of millions of years ago before the time of the dinosaurs – therefore we call them fossil fuels.

       Fossil fuels take millions of years to make. But they are not unlimited. We are using up the fuels that were made more than 300 million years ago. They are not renewable like solar power, wind power, hydro power or biomass. Once they are gone they are gone. So, it’s best not to waste fossil fuels.

       We can save fossil fuels by conserving energy. One simple way to do this is to turn off appliances, TVs and radios that we are not using. We can also turn off lights when no one is in the room. Another way is to go by bike or walk instead of driving cars or motorbikes.

   A. Write true or false for the statements:

   1. Three major forms of fossil fuels are oil, coal and natural gas.                  ……………………..

   2. They were formed right after the time of dinosaurs.                                     ……………………..

   B. Answer the questions:

    1. How can we save fossil fuels?

      ……………………………………………………………………………………………………………….

    2. How long does it take to make fossil fuels?

      ……………………………………………………………………………………………………………….

    3. Is it best to waste fossil fuels?

      ……………………………………………………………………………………………………………….

IV. Read and choose the answer.

                                        FOSSIL FUELS

The sun’s energy is stored in coal, natural gas, water and wind. Coal, oil and natural gas are known as fossil fuels. Fossil fuels were formed over millions of years when the remains and fossils of prehistoric plants and animals sank to the bottom of swamps and oceans.

We use the energy in these fossils fuels to make electricity. We use electricity in many different  ways. We light and heat our homes, schools and businesses using electricity, and to run computers, refrigerators, washing machines and air conditioners. Our cars and planes run on gasoline, which comes from oil. As of the year 2013, most of the energy we use comes from fossil fuels.
1. Where is the sun’s energy stored?

__________________________________________________________________________

2. What is the example of fossil fuels?

__________________________________________________________________________

3. Where do we get most of electricity from?

__________________________________________________________________________

4. What do we use electricity for? 

__________________________________________________________________________

5. Where does gasoline some from?

__________________________________________________________________________

2. Listen and read the text. Complete each sentence with ONE word.

(Nghe và đọc văn bản. Hoàn thành mỗi câu với MỘT từ.)

1. ……………… fuels are limited, and they cause pollution.

2. Solar energy is ………………  because the sun never stops producing sunlight.

3. They install giant wind ……………… to get much more power all at once.

4. Our planet will be ……………… if we stop using fossil fuels.

5. There is no ……………… to solar energy and wind power.

Almost all our energy comes from oil, coal, and natural gas. We call them fossil fuels. The earth’s fossil fuels are running out. What will happen when there is no coal, oil and gas on earth?

Scientists are trying to find and use other alternative sources of energy. We can use energy from the sun, the wind, and the water.

Solar energy is unlimited. The sun supplies all the energy used to grow plants, to evaporate water for rain, and to maintain the temperature of the planet. All are necessary for human life. If we are able to collect solar energy, we will be sure to have this abundant source of power.

1. From which do plants on the earth get energy?

A. Stars

B. The Mars

C. The moon

D, The sun

2. What are the other words or phrase for fossil fuels?

A. Natural

B. Oil

C. Coal

D. Oil, gas, natural gas

3. Natural sources of energy are energy from..............

A. Wind

B. The sun

C. Water

D. The sun, wind, water

4. The word "abundant" in the passage is closet in meaning with............

A. Plentiful

B. Limited

C. Natural

D. Necessary

Almost all our energy comes from oil, coal, and natural gas. We call them fossil fuels. The earth’s fossil fuels are running out. What will happen when there is no oil, coal and gas on the earth? Scientists are trying to find and use other alternative sources of energy. We can use energy from the sun, the wind, and the water. Solar energy is unlimited. The sun supplies all the energy used to grow plants, to evaporate water for the rain, and to maintain the temperature of the planet. All are necessary for human life. If we are able to collect solar energy, we will be sure to have this abundant source of power.

66.What are the other words or phrase for fossil fuels?

A. oil                       B. oil, gas, natural gas         C. natural gas                      D. coal

67.Natural sources of energy are energy from      .

A. the sun, wind, water                                      B. water                              C. wind                   D. the sun

68.From which do plants on the earth get energy?

A. the moon            B. the sun                           C. stars                              D. the Mars

69.We are asking the question, “What will happen when there is no oil, coal, and gas on the earth?” because           .

A. we are looking for other alternative sources of energy                                 B. we are looking forward to seeing great changes

C. we are now depending so much on oil, coal, and natural gas

D. other sources of energy can come from the sun, wind, and water

70.The word “abundant” in the passage is closest in meaning with            .

A. natural                B. necessary                       C. plentiful                          D. Limited

1. Fill in the blanks with the words from the text on page 94.

(Điền vào chỗ trống với các từ trong văn bản ở trang 94.)

1. Solar energy is renewable ………… the sun never stops producing sunlight.

2. Solar panels catch sun rays ………… change them into electricity.

3. We use fossil fuels in our daily life, ………… they are limited and cause pollution.

4. There is nothing to lose when we use solar energy ………… wind power.