Extreme Amazon

The Amazon River begins in the Andes Mountain in Peru. It travels about 6,000 kilometers to the Atlantic Ocean. It is the largest river in the world. It is also the second longest. Most of the Amazon's water comes from rain. During the rainy season parts of the river are 190 kilometers wide.

The Amazon River goes through the world largest rain forest. The Amazon rain forest is home to the highest number of plant and animal species on Earth. There are around 2.5 millions kind of insects, such as the world's largest ant. At least, 3,000 kinds of fish live there, and one-fifth of all the bird species in the world.

Some of the Amazon's animals are dangerous, such the anaconda, the largest snake in the world.

The Amazon is very important to Earth. If we lose the Amazon, we will lose a big part of life on Earth

Xác đinh lỗi trong bài

(1) Scientists have been studying an ocean event who is the cause of drastic changes in weather around the world. (2) This event is an increase in the temperature of the Pacific Ocean that appear around Christmas off the coast of Peru. (3) Hence, the Peruvian fishermen whom first noticed it named it El Nino, a name that means "the Christ child" in Spanish. (4) The causes of this rise in ocean temperatures are unknown, but its effects are obvious and devastating.

• (5) One of El Nino's far-reaching effects is that it threatens Peru's vital anchovy harvest, which could mean higher prices for food. (6) The warm water of El Nino keeps the cold water which provides anchovies with food down at the bottom of the ocean. (7) Anchovies are the primary source of fish meal which is the main ingredient in livestock and chicken feed."

(8) In addition, guano from birds who feed off the anchovies is a major source of fertilizer for farmers. (9) As a result of decreasing supplies of anchovies and guano, the prices of chicken feed, livestock feed, and fertilizer rise. (10) This causes farmers, who they must pay more for feed and fertilizer, to charge more for the food they produces. (11) The prices of eggs, meat, and even bread have soared as a result of El Ninos in past years.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions

If the salinity of ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation-conversion of liquid water to water vapor. In this manner, the salinity is increased, since the salt behind. If this is carried to the extreme, of course, white crystals of salt would be left behind.

The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean. Here the ocean is being diluted so that the salinity is decreased. This may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation or runoff.

Normally, in tropical regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas.

A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.

In the Weddell Sea, off Antarctica, the densest water in the ocean is formed as a result of this freezing process, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portions of the oceans of the world. 

According to the passage, the ocean generally has more salt in 

A. coastal areas 

B. rainy areas 

C. turbulent areas 

D. tropical areas 

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions

If the salinity of ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation-conversion of liquid water to water vapor. In this manner, the salinity is increased, since the salt behind. If this is carried to the extreme, of course, white crystals of salt would be left behind.

The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean. Here the ocean is being diluted so that the salinity is decreased. This may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation or runoff.

Normally, in tropical regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas.

A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.

In the Weddell Sea, off Antarctica, the densest water in the ocean is formed as a result of this freezing process, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portions of the oceans of the world.

Which of the following is NOT a result of the formation of ocean ice? 

A. The surrounding water sinks 

B. Water salinity decreases 

C.The salt remains in the water 

D. The water becomes denser 

sắp xếp các từ sau 

1 oldest / is / city / Central Viet Nam / in / Hue

2 the test / we / talk / during / mustn't

3 in / lake / the / biggest / the world / the Caspian Sea / is

4 brush / you / your teeth / must / three times a day

5 the / largest / ocean / in / is / the Pacific / the world

6 is / what / mountain / the / in / highest / Asia?

7 when / you / be / crossing / the street / must / careful

8 class / use / in / your mobile phone / you / mustn't

The Indian Ocean is the world's third largest ocean, after the Pacific and Atlantic Oceans. It (1) ______ to the south of Asia, to the west of Australia and Indonesia, and to the east of Africa. Unlike the Atlantic and Pacific, it has no (2) ___ opening to the north. Therefore, the Suez Canal, (3) _____ opened in 1869, is a very important shipping route (4) _____ the Indian Ocean and the Mediterranean Sea. The waters of the Indian Ocean are (5) _____ calmer than those of the Pacific and Atlantic Oceans, and are, therefore, easier to travel across. There are about 5,000 islands in the Indian Ocean. (6) _____, such as the Seychelles and Maldives, have beautiful beaches and a warm climate, and now (7) _____ increasing numbers of tourists. During the winter, cool, dry winds blow over the ocean from the northeast. In summer, the (8) ____ of the wind changes and south-easterly winds blow north from the ocean, bringing (9) ___ rains called monsoons' to coastal areas. (10) ____ farmers depend on these rains, they can be a problem, often causing serious flooding

.1. A. lies B. finds C. puts D. gets

2. A. right B. natural C. realistic D. correct

3. A. when B. what C. where D. which

4. A. among B. on C. between D. by

5. A. too B. much C. very D. so

6. A. Many B. Each C. All D. Any

7. A. catch B. lead C. call D. attract

8. A. direction B. development C. progress D. balance

9. A. thick B. large C. heavy D. high

10. A. Because B. Although C. However D. Whether