1. Silver is used for photography. 2. Chemical number of silver is 49. 3. Silver is a good conductor of electricity. 4. Sterling silver consists of 99% of silver and 1% of other metals. 5. Silver can be found naturally as an alloy with copper. 6. Today gold is valued 50 times the value of silver. 7. The word “silver” has many rhymes in English.
2. Give synonyms to the following words from the text:
a number of, good, a property, to be made up, various, to fluctuate, dramatically, to increase, difficult.
|malleable||ковкий||a burial mask||поховальна маска|
|amount||кількість||a trophy||приз, нагорода|
Gold is a chemical element whose chemical symbol is Au and atomic number is 79. Compared to other metals, gold is less chemically reactive; it is a good conductor of electricity and heat. Gold is shiny, soft and dense. It is also malleable, which means it can easily be beaten into thin sheets or other shapes. Gold is malleable enough for just 1 gram to be hammered into a sheet 1 square meter in size. It can also be made so thin that it appears transparent.
Due to a similar appearance to gold, the mineral pyrite has the nickname “fool’s gold”. The amount of gold in various alloys (a combination of gold and another metal such as silver) is measured in carats (k). Pure gold is 24k.
As of 2009, it has been estimated that humans have mined around 160,000 tonnes of gold. Over the last 100 years South Africa has been second to none in production of gold. In recent times however it has been surpassed by China.
As of 2009, the USA has 8,133 tonnes of gold reserves while Canada only has 3. Throughout history gold has often been seen as a symbol of wealth. It is the most popular precious metal for investments. The price of gold continually fluctuates and is often linked to major economic events. There is a monetary system called the ‘gold standard’ which fixes a unit of money to a certain weight of gold.
Over the years gold has been used to create expensive jewelry, coins and various forms of art such as the Egyptian pharaoh Tutankhamen’s famous burial mask. In modern times it has also been used for things such as electronics and dentistry.
Injectable gold has been proven to help reduce pain and swelling in patients suffering from tuberculosis and rheumatoid arthritis.
Gold is a popular choice when it comes to rewarding achievement with medals, statues and trophies. Academy Award, Olympic and Nobel Prize winners all receive golden items in recognition of their achievements.
|second to none||перший; неперевершений|
|In intelligence he is second to none.||Він – найрозумніший.|
|Gold has been proven to help ...||Доказано, що золото допомагає ...|
|The letter is expected to come in two days.||Очікується, що лист надійде через два дні.|
|when it comes to||коли доходить справа; коли йдеться|
|When it comes to eating, he is the first.||Коли справа доходить до їжі, він – перший.|
|When it comes to physics, they can argue for hours.||Коли йдеться про фізику, вони можуть сперечатися годинами.|
Дата добавления: 2015-10-30; просмотров: 95 | Нарушение авторских прав
|<== предыдущая страница|||||следующая страница ==>|
|Say whether these statements are TRUE or FALSE.|||||Say whether the statements are TRUE or FALSE.|