Earthquakes
What is an earthquake?
1. A shaking and vibration of the ground caused mainly by a sudden release of energy in the Earth's crust.
2. A shaking and vibration of the ground caused mainly by a sudden release of fire in the Earth's core.
3. A shaking and vibration of the ground caused mainly by a sudden release of energy in the Earth's core.
4. A shaking and vibration of the ground caused mainly by a slow release of fire in the Earth's crust.
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