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Rocks beneath the crust are in a semi-solid state due to high temperature and high pressure.When pressure decreases,the rocks become semi-fluid and are known as magma. Earth movements cause vertical or horizontal cracks in the rocks.The molten rock forces itself through the cracks.When magma cools and solidifies in a horizontal crack or bedding plane,a sill is formed.
maurice.mutuku answered the question on June 5, 2017 at 09:22
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