Answer :
Final answer:
Soil liquefaction can be caused by earthquakes and the pressure of repeated footsteps on beach sand, but not by lowering the temperature; hence the correct answer is (E) A and B but not C.
Explanation:
Liquefaction of soil can be induced by various factors. It is a phenomenon often observed during certain geological events. The options provided relate to possible causes of soil liquefaction:
- (A) earthquakes: Liquefaction occurs when loose, water-logged soils near the surface lose their strength in response to strong ground shaking.
- (B) repeatedly stepping onto beach sand: This can cause a localized form of liquefaction, as the pressure from stepping compresses the sand and expels water from the spaces between sand particles.
- (C) lowering the temperature: This is not typically associated with the liquefaction of soil, which is related to the loss of strength in soil particles due to water or other changes, rather than temperature effects.
Therefore, the correct answer is (E) A and B but not C. While earthquakes and impacts like stepping on sand can induce liquefaction, changing temperature is not a cause for this.
