Recent activity at a volcano is characterized by:
A layer of ash blanketing hillslopes
Which of the following is not evidence of recent activity at a volcano?
A. Thick, well-developed soil
B. Layer of ash blanketing hillslopes
C. Unweathered lava flows
D. Ash flows lacking a well-developed soil
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What scientific concept do you need to know in order to solve this problem?
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