In Contrast to an Old Ash-Flow Deposit,an Old Ash-Fall Tuff

question 35

Multiple Choice

In contrast to an old ash-flow deposit,an old ash-fall tuff does NOT include which of the following?

• A) thin layers
• B) layers that become coarser-grained toward the base
• C) ash that evenly coats hills and valleys
• D) ash that is never welded to black obsidian
• E) differences in thickness based on valleys and hills

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