The semi-molten rock underneath a volcano., Magma, A volcano that is said to be dormant., Inactive, Part of a typical volcano is described as the opening through which volcanic materials are ejected., Crater, A type of volcano has broad summit areas, which makes it resemble a warrior's shield, Shield Volcano, Other term for dead volcanoes. , Extinct, Another term for a sleeping volcano., Dormant, The gradual increase in the temperature of the atmosphere caused by human activity., Global Warming, A layer of gases that surrounds a planet or other celestial body, held in place by gravity., Atmosphere, The second layer of Earth's atmosphere, located above the troposphere and below the mesosphere., Stratosphere, A colorless and odorless gas, makes up about 78% of Earth's atmosphere., Nitrogen.

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