The effects of land subsidence due to groundwater extraction are ...

[james]

The effects of land subsidence due to groundwater extraction are generally ____.
   a. problems for a period of months, until more groundwater seeps in to deep clays
   b. permanent and irreversible
   c. in effect for several years, until major storms irrigate the area
   d. reversible by returning water to the aquifer
   e. unpredictable and impossible to plan for effectively

Question 2

The uneven, potholed surface of karst is caused by ____.
   a. erosion from ancient streambeds
   b. the pattern of deposited material from glaciers
   c. hardening of volcanic ash into tuff
   d. swelling due to the absorption of water
   e. the dissolution of the surface in the presence of acids

[mmj22343]

Answer to Question 1

ANSWER: b

Answer to Question 2

ANSWER: a