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

Question

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

Answer 1

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]