Columnar Joints Form When ________

question 41

Multiple Choice

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

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Definitions:

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