How Can a Sill Be Distinguished from a Lava Flow

question 11

Multiple Choice

How can a sill be distinguished from a lava flow?

• A)A sill is generally finer-grained than a lava flow.
• B)Rocks above and below a sill will show evidence of heating,but only the rocks below a lava flow will show evidence of heating.
• C)Sills generally have vesicles; lava flows generally do not have vesicles.
• D)Sills generally overlie soils; lava flows do not generally overlie soils.

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Supervisory Control and Data Acquisition system, a computer system for gathering and analyzing real-time data to monitor and control processes.

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