Set up a correspondence between atmosphere constituent gasses and digital indicators of their concen...: ответ на тест 1056231 - Экология

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The universe is energy. Energy 1 _______ in a variety of forms that include everything, from an atomic particle to a group of galaxies. Everything around us is matter and matter is 2 _______ from atoms.
We know over one 3 _______ kinds of basic atoms. They correspond to basic elements like nitrogen, oxygen, carbon, and others. An atom is a unit of matter.
Atoms form groups called molecules. Different 4 _______ of atoms or molecules created different kinds of matter. An oxygen molecule, for example, is made from two oxygen atoms. A carbon dioxide molecule is made from two oxygen atoms and one carbon atom.

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What is steel as a construction material? Steel may be classified as iron with the controlled amount of carbon. The amount of carbon in steel is generally less than 1.7 per cent. Ordinary structural steel should contain less than three tenth of one per cent carbon. This kind of steel also contains small amounts of phosphorus, sulfur, oxygen, nitrogen and silicon. Like iron and its alloys, steel belongs to ferrous metals. It is hard substance. Accordingly, it can be pulled, forged and melted. Generally, steel, this strong metal, like other metals, is a good conductor of electricity. Alloyed steel and stainless steel are corrosion-resistant kinds of steel.
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Steel belongs to …

The noise level produced by a bus moving down the street is 90 dB. The sanitary-hygienic standard of the noise level is 40 dB, thus the noise produced by a bus exceeds it by _______ times. (Give your answer as a whole number.)

In the food web you see in the picture ______ and ______ act as both a predator and a prey at the same time.

Which of the following can refer to chemical pollutants:

Regional geosystem monitoring presumes …