Answered

1. which of the following is an opening in the earth's crust through which molten rocks, hot gases, and solid rocks are expelled?

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Answer:

Volcano

Explanation:

The term volcano also refers to the opening or vent through which the molten rock and associated gases are expelled. Driven by buoyancy and gas pressure the molten rock, which is lighter than the surrounding solid rock forces its way upward and may ultimately break though zones of weaknesses in the Earth's crust.