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Final answer:

Pahoehoe and aa are basaltic lava flows with distinct appearances and textures formed during effusive eruptions of low-viscosity magma.


Explanation:

Pahoehoe is a highly fluid basaltic lava flow that spreads in thin sheets, characterized by its smooth, ropey appearance. It forms due to low-viscosity lava that can continue to flow internally within a tube, creating lava tubes. On the other hand, aa lava has a crumbly blocky appearance, is more viscous, and forms a rough, clinkery surface. Both types are associated with effusive eruptions of low-viscosity, basaltic magma.


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