Subsidence is the lowering of the land-surface elevation from changes that take
place underground.
true
false

ANSWER:

Subsidence is the "lowering of the land-surface elevation" from changes that take  place underground is true.

EXPLANATION:

Land subsidence takes place because of the changes that take place underground. These changes impact the elevation and level of land causing it to become low. The most common causes of subsidence include oil drilling, pumping water and also the "dissolution of limestone aquifers". Subsidence is not considered to be good for land and has many adverse impacts on the land. Subsidence causes damage to roads and highways. It also results in damaged buildings and well casings. Subsidence also brings with it problems associated with flooding because a small change in land gradient can adversely impact the drainage system.

The right answer is b hydrogen bonds!

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