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1. Say whether these statements are true or false.

1. The word diamond comes from the Latin word meaning unbreakable. 2. The softest mineral on Mohs scale of mineral hardness is talc. 3. Diamond is the worst known thermal conductor among naturally occurring substances. 4. Most of the Earth’s natural diamond deposits are found in Siberia. 5. Diamonds are valued according to their size. 6. The Koh-i-Noor diamond, which was found in India, now is kept in the Tower of London. 7. The synthesized material known as cubic zirconia is at times in competition with diamond because it is durable and cheap.

2. Give synonyms to the following words from the text:

unnatural, to arrange, substance, controversy, explosive, to occur, frequently, to transform, shape, to appear, durable, to create.

8. Coal

shiny

блискучий

to undergo

проходити (напр. лікування), підлягати

flame

полум’я

lungs

легені

a furnace

піч

cancer

мед. рак

Coal is made largely of carbon but also features other elements such as hydrogen, oxygen, sulfur and nitrogen.

Coal starts off as plant matter at the bottom of water. It is eventually covered and deeply buried by sediments where over time metamorphosis (a change in form) takes place. Different types of coal contain different amounts of carbon. Lignite contains only around 60 to 75%, while anthracite contains more than 92%. Anthracite is a hard, shiny, black coal that burns with a blue, smokeless flame. While most forms of coal are associated with sedimentary rock, anthracite undergoes metamorphism and is linked to metamorphic rocks.

Coal has long been burned to create electricity and heat. The use of coal is increasing every year, in 2006 the world consumed over 6,000,000,000,000 kilograms of coal! Coal is the world’s largest source of energy for the production of electricity. Coal is converted to electricity by being burned in a furnace with a boiler. The boiler water is heated until it becomes steam, with the steam then spinning turbines and generators to create the electricity. Nearly 70% of China’s electricity comes from coal. In total, coal produces around 40% of the world’s electricity.

Coal mining and the subsequent burning of coal can have many bad effects on both humans and the environment. Examples of this include waste products, acid rain, contaminated water, poisonous emissions, high levels of carbon dioxide and increased risks of lung cancer for coal plant workers.

A popular saying among many cultures is that if you behave badly during the year, Santa will deliver you a lump of coal for Christmas.

Speech patterns

The boiler water is heated until it becomes steam.

Воду в бойлері нагрівають до тих пір, поки вона не стане паром.

If water freezes, it turns into ice.

Якщо вода замерзає, вона перетворю-ється на лід.

If you behave badly during the year, Santa will deliver you a lump of coal for Christmas.

Якщо ви будете погано вести себе протягом року, Санта на Різдво принесе вам шматок вугілля.

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