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Concrete is a mixture of cement, sand, gravel and water. It is used a lot in construction. To shape the concrete, the wet mixture is poured into a wooden or steel frame until it dries and becomes hard…
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Match. The structure of a construction
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Match the definitions to the terms: They rest on the pillars. They rest on the beams. They are vertical supports which rest on the foundations. The pillars stand on this solid structure. A resistant…
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The origin of coal
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Much of the coal on Earth was formed 300 million years ago, during the Carboniferous period. The coal was formed where the climate was hot and humid, and there were extensive areas covered in lush…
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What is sedimentation?
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Sedimentation is the process of depositing materials. It can happen in different ways: Dissolved material in a river may be deposited if the water evaporates. A rock mineral called calcite is formed in…