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A ground/earth fault is a fault where part of the current returns back through a path other than the opposing hot or, more critically, neutral. A neutral/earth fault is dangerous because the circuit will continue to function normally, but the hot and neutral leg currents are imbalanced, and the chassis can become energized.
The Earth's lithosphere is extremely active, as continental and oceanic plates constantly pull apart, collide and scrape alongside each other. When they do, they form faults. There are different types of faults: reverse faults, strike-slip faults, oblique faults, and normal faults. In essence, faults are large cracks in the Earth's surface where parts of the crust move in relation to one another.