Models can be conceptual, graphical or mathematical as they are used in science. It allows one to break down a concept into simpler terms with a visual component. A limitation of models in science is that they are usually simplified versions of the real situation or concept.
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The Franks were a group of Germanic peoples whose name was first mentioned in 3rd century Roman sources, and associated with tribes between the Lower Rhine and the Ems River, on the edge of the Roman Empire.
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I am currently working on this drawing, will be done by midnight.
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The biggest causes are vehicle pollution, industrial emissions, thermal power plants, construction dust, waste burning and millions of poor households' use of cheap and dirty fuels such as wood and cow-dung for cooking.
