Answer:
Reasonable Second step- 
Explanation:
The given single step chemical reaction is as follows.

Suppose a two-step mechanism is proposed for this reaction,
The reaction occured in two steps they are as follows.


Answer:
running water and glaciers
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B.) When atoms share electrons/......
Pahoehoe: A hot, fast-moving type of lava that hardens to form smooth, ropelike coils<span>
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