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METALS AND NONMETALS
There are some distinctions between metals and nonmetals. Metals are
distinguished from nonmetals by their high conductivity for heat and electricity, by
metallic lustre and by their resistance to electric current. Their use in industry is
explained not only by those properties, but also by the fact that their properties,
such as strength and hardness, can be greatly improved by alloying them with other
metals.
There are several important groups of metals and alloys. The common metals such
as iron, copper, zinc, etc. are produced in great quantities.
The so-called precious metals include silver, gold, platinum and palladium. The
light metals are aluminum, beryllium and titanium. They are important in aircraft
and rocket construction.
Many elements are classified as semimetals (bismuth, for example) because they
have much poorer conductivity than common metals.
Nonmetals (carbon, silicon, sulphur) in the solid state are usually brittle materials
without metallic lustre and are usually poor conductors of electricity. Nonmetals
show greater variety of chemical properties than common metals do.
Metals can undergo corrosion, changing in this case their chemical and
electromechanical properties. In order to protect metals from corrosion the
products made of metals and steel are coated by some films (coatings). Organic
coatings protect metals and steel from corrosion by forming a corrosion-resistant
barrier between metal or steel and the corrosive environment.

Some people say that damage to the environment is the biggest problem facing the world. However, other people say that there are other problems that are more important.

Some people think that environmental problems are the most dangerous whereas others don’t agree.

I think that nowadays environmental catastrophe is the biggest threat. First of all, global worming can bring us a lot of troubles. If the ice melts, a lot of countries will be flooded. Second, Ozone holes can cause the death of a lot of lands. Also bad food, air and water can be the reason of various diseases.

At the same time there are people who say that overpopulation, lack of food and nuclear war can be even more dangerous.

In my opinion these people have a point. These threats can kill our planet too. Nevertheless, they are easier to control than environmental problems. Nuclear moratorium, new technologies allow us to solve these problems.

In conclusion I'd like to say that if we weigh all the facts that say that danger to the environment is the biggest problem against the ones that support other threats, we'll see that the facts that support the statement outweigh those against.

вот это все - формат ЕГЭ, не знаю, подойдет ли(

Today, the role of a mobile phone in a person's life is difficult to overestimate. With this compact device, we can quickly contact our relatives, friends, and work colleagues at any time to find out the information we are interested in. At the same time, you do not need to strain your memory and remember the phone number of an old friend who has not been dialed for a long time, the mobile phone notebook is always at hand. Many people store a lot of other information on their phone in addition to their contacts – they write down their ideas and thoughts, credit card numbers, memorable dates, various files, etc. In other words, the phone immediately replaces our notebook. And all sorts of useful programs, functions, and options that modern cell phones are equipped with make this small-sized device so multifunctional that you sometimes wonder.

Объяснение:

I hope it helped!)