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Question: Which type of basaltic lava flow has its surface covered with sharp-edged, angular blocks and rubble?

Options:

  1.  Scoria
  2.  Pahoehoe
  3.  Pillow lava
  4.  aa

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4.  aa type

aa type of basaltic lava flow has its surface covered with sharp-edged, angular blocks and rubble.

'A'ā is a Hawaiian term for lava flows that have a rough rubbly surface composed of broken lava blocks called clinkers. [Source]

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