Liquefaction is A. A quicksand-like condition arising in some wet soils during earthquakes. B. Flooding caused by tsunamis. C. Flooding of coastal areas due to tectonic subsidence. D. Flooding caused by dam failure resulting from an earthquake.

a. a quicksand-like condition arising in some wet soils during earthquakes.

Explanation:

Liquefaction is a phenomenon that occurs when saturated soils start behaving like liquid. An earthquake can trigger this phenomenon with vibrations that breaks down soil stiffness. Because soil particles rely on each other to stay in place, the change in stress between them causes them to lose grip.

Liquefaction can cause a lot of damage, especially to infrastructures that are build on them. When soil lose strength, they may not be able to carry the structure above them and cause it to collapse.

A. A quicksand-like condition arising in some wet soils during earthquakes.

Explanation:

Soil liquefaction is a process in which saturated soil moves when triggered by forces such as earthquake. It is usually described as a quicksand-like condition in which a soil suddenly loses its cohesion due to being saturated by excess water molecules. The water molecules reduces internal friction between soil particles and exposes soil to rapid movement. Liquefaction accompanies earth tremor and earthquake most of the time.