Yardangs form from
A) sedimentary rock, which is strong enough to stay standing but soft enough to abrade.
B) metamorphic rock, which is strong enough to withstand extensive abrasion without being completely eroded and swept away.
C) igneous intrusions, which are left standing after sedimentary rock around it has been eroded.
D) volcanic rock, which is soft and easily abraded.
Answer: A
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