Columnar joints form when ________.
A) a lava flow cools very rapidly,causing the flow to shatter in a chaotic pattern
B) a lava flow encounters groundwater,which causes the flow to rapidly fracture
C) a lava flow erupts under deep water
D) during the final stages of cooling,a lava flow contracts,forming tall polygonal fractures
Correct Answer:
Verified
Q2: Common volcanic gases include the following:
A) water
Q3: The image below shows a lava dome
Q4: Ash,cinders,and blocks are all types of _.
A)
Q5: _ are snowball-like lumps of ash formed
Q6: The textural term for a basaltic lava
Q7: Basaltic lavas that have rough,rubbly surfaces are
Q8: The pillow basalts in the photo below
Q9: Compared to felsic lavas,mafic lavas have a
Q10: Pele's hair _.
A) consists of thin strands
Q11: The characteristic "rotten egg" smell of many
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