What is true about landslides?

a. they can be so slow that you can barely notice it.

b. they are caused when clay soil turns to liquid.

c. they are the most destructive kind of mass movement.

d. the material moves downward as one large mass.

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.