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| How can human activites affect Earths climate? | |
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| One cause of climate change is the addition of carbon dioxide and the other greenhouse gases into the atmosphere. | |
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| Under certain conditions, small amounts of mantle rock can melt forming liquid magma. The magma rises upward through the crust, erupting at the surface as a volcano. | |
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| Why are some volcanic eruptions quiet and others explosive? | |
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| Volcanoes erupt explosively or queitly, depending on the characteristics of the magma | |
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