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How is Coal Formed ?

Since the 13th century coal is derived from the Old English term col, which means "mineral of fossilized carbon".

Coal consists of high content of carbon and other elements like, sulfur, hydrogen, oxygen, and nitrogen.

Coal is a naturally black sedimentary rock occurring in rock strata in layers or veins called coal beds or coal seams.

Anthracite coal is the solider form of coal, can be considered as metamorphic rock because of later exposure to high temperature and pressure.

Recommended Article : http://frndzzz.com/Advantages-Disadvantages-of-Coal to learn more about fossil fuel.

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Disadvantages & Advantages of an GC

Disadvantages & Advantages of an GC.

Gas chromatography (GC) is an analytical method which is used for the separation of an volatile substance from a give mixture of compounds which are very difficult to separate and analyse.

This type of chromatography separates the molecules based on the volatility of a substance.

The substance with more volatility will separate out quickly while the substance with less volatility will elute out slowly.

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Advantages and Disadvantages of International Trade

Check out Advantages and Disadvantages of International Trade discussed below. So let us find out some information on advantages and disadvantages to know more about International Trade. It is a trade between nations in the form of imports as well as exports. International trade can be considered one of the important souce of revenue in the developing countries. Trade between countries is the exchage of both services and goods among the countries of the world economy.