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A polymer is a giant molecule made up of thousands of atoms. It can be natural or man-made (synthetic). Many plastics in everyday use are polymers, such as polythene or PVC; but then so is cellulose, which makes up wood pulp from which paper is manufactured.

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Kategori: Perubahan iklim
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рафинирање на нафта

Lingkungan alamiah; Perubahan iklim

Oil refining is the process of taking crude oil and turning it into fuels such as petrol and diesel. Crude oil varies in its composition, consisting of hydrocarbons and other ...

органско земјоделство

Lingkungan alamiah; Perubahan iklim

There is no universally accepted definition of organic farming, and each country regulates what can and cannot be labelled "organic". In general, it describes a form of ...

озон

Lingkungan alamiah; Perubahan iklim

Ozone is made up of three oxygen atoms. It has benefits and dangers depending on where in our atmosphere it occurs: near ground level, it is a pollutant that affects respiration; ...

емисии по глава на жител

Lingkungan alamiah; Perubahan iklim

The total amount of greenhouse gas emitted by a country per unit of population.

пестицид

Lingkungan alamiah; Perubahan iklim

A pesticide is a substance used to kill a pest, and in a farming context a pest is anything that attacks or competes with crops. Hence, there are many different types of ...

фотоволтаична клетка

Lingkungan alamiah; Perubahan iklim

Photovoltaics are materials that produce electricity from sunlight. A single photovoltaic cell can be used to power small devices such as calculators; combined in solar panels ...

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Industri / Domain: Tembakau Kategori: Perlengkapan merokok

ззпалка

Запалката е преносливо средство кое се користи за генерирање на пламен. Таа се состои во контејнер со запалива течност, средство за палење, и некои ...