A Big Bulge Sometimes Slowly Grows on the Flank of an Active

question 3

Multiple Choice

A big bulge sometimes slowly grows on the flank of an active Cascades volcano.Why?

• 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.