Computer science or computing science is the study of the theoretical foundations of information and computation, and of practical techniques for their implementation and application in computer systems. it is frequently described as the systematic study of algorithmic processes that create, describe and transform information. according to peter j. denning, the fundamental question underlying computer science is, "what can be (efficiently) automated? ". computer science has many sub-fields; some, such as computer graphics, emphasize the computation of specific results, while others, such as computational complexity theory, study the properties of computational problems. still others focus on the challenges in implementing computations. for example, programming language theory studies approaches to describing computations, while computer programming applies specific programming languages to solve specific computational problems. the general public sometimes confuses computer science with vocational areas that deal with computers (such as information technology), or think that it relates to their own experience of computers, which typically involves activities such as gaming, web-browsing, and word-processing. however, the focus of computer science is more on understanding the properties of the programs used to implement software such as games and web-browsers, and using that understanding to create new programs or improve existing ones.
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1. Nowadays scientists worry about ecology and its meaning very much.
2. In summer people, especially children, are fallen under the ultraviolet radiation.
3. I don't like this water filter. I think, we should find another one.
4. There are so few places with the safe habitat.
5. The destruction of fish in this lake is really ecological problem.
6. What can cause the pollution of this power supply?
7. People can't imagine, how often they pollute the air, water and ground themselves.
8. The dump of rubbish is forbidden in this place.
9. The waste should be worked over by special plants.
10. The environment protection is really important question at this conference.
Объяснение:
Now fast food is very popular. Many people like it and often visit fast food cafes. There everyone can eat pizza, hamburgers, chips and drink sodas. These products are very tasty, so adults and children prefer them. In addition, they are cheap. They can be cooked quickly. Now there are many cafes in which you can come to lunch and quickly eat. But according to some opinions fast food is bad for health. Some people are sure that such food leads to different diseases, so it is necessary to eat healthy food. Many people like tasty food, but they do not think about its harm. Fast food has many advantages. This food is delicious and cheap. Everyone can buy and eat it in a cafe, at home or in transport. But fast food has much harm. For example, a lot of preservatives, dyes, oil are contained in it. These substances harm human health, lead to obesity. There are problems with the stomach, heart, liver, which appear because of fast food. Also, unhealthy food makes the skin ugly.