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Freddy Garza
Biology
12 February, 16:43
What processes caused coal to form?
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Elisa Branch
12 February, 16:45
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The weight of the top layers and the water and dirt packed down the lower layers of plant matter. Heat and pressure produced chemical and physical changes in the plant layers which forced out oxygen and left rich carbon deposits. In time, material that had been plants became coal.
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Mira Dougherty
12 February, 16:54
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i believe it's pressure and heat.
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