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Many sidewalks have areas that are uneven or even completely broken. This is usually caused by A. tree roots wedging underneath B. lichen living on the surface. C. oxidation of the cement due to oxygen.
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Many sidewalks have areas that are uneven or even completely broken. This is usually caused by

A. tree roots wedging underneath
B. lichen living on the surface.
C. oxidation of the cement due to oxygen.
D. contact with other rocks.

User Carles Andres
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2 Answers

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C.) oxidation of the cement due to oxygen
User Swalkner
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1 vote

Answer:

C

Step-by-step explanation:

User Number Logic
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