Question

Seismic waves and water can weaken soil, causing it to move. This is called _____.

flooding
liquefaction
seismic shifting
earthquake erosion

Answer 1

Seismic waves and water can weaken soil, causing it to move. This is called earthquake and erosion. Earthquake happens when the Earth is shaking and usually causes big damages on infrastructures. Erosion is the slowly breaking of either water, wind, etc.

Answer 2

The answer is liquefaction.

This is a phenomenon that occurs when soil saturated in water or unconsolidated soil becomes a suspension because of an earthquake. The earthquake reduces the strength and stiffness of the soil. The vibrations from the earthquake and water pressure cause the soil particles to loosen.