What Causes a Big Bulge to Slowly Grow on the Flank

question 26

Multiple Choice

What causes a big bulge to slowly grow on the flank of an active Cascades volcano?

• A) Thick lava flows pile up around the vent.
• B) A huge gas bubble released from the magma inflates it.
• C) The magma reacts with snow on the volcano, causing magma inflation.
• D) The hot magma melts older ash, causing it to expand.
• E) Rising magma is pushing it up.

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