When a rock deforms plastically, it
(a) fractures.
(b) changes its size or shape temporarily.
(c) changes its size or shape permanently.
(d) changes its mineral composition.
Why are faults important?
(a) They are the usual locations of earthquakes.
(b) They control the movement of groundwater.
(c) They control the subsurface accumulations of fossil fuels.
(d) all of these
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