Volcanoes erupt because of density and pressure. The lower density of the magma relative to the surrounding rocks causes it to rise.
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Answer:
32
Explanation:
By 1860, 90 percent of the nation's manufacturing output came from northern states. The North produced 17 times more cotton and woolen textiles than the South, 30 times more leather goods, 20 times more pig iron, and 32 times more firearms. The North produced 3,200 firearms to every 100 produced in the South
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