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A volcano is a vent, or opening, in Earthâs surface through which molten rock, gases, and ash erupt. The word also refers to the form or structure, usually conical, produced by accumulations of erupted material.
1. The primary source of energy for the earth's atmosphere is: a. energy from within the earth . b. the sun . c. erupting volcanoes . d. lightning discharges associated with thunderstorms . e. latent heat released during the formation of hurricanes . ANSWER: b . 2. The most abundant gases in the earth's atmosphere by volume are: a. carbon dioxide and nitrogen