Highly fluid basaltic lava may cool with a smooth,ropy surface called pahoehoe,whereas lower temperature,slower flowing,more viscous basaltic lava commonly has a rough,blocky texture called a.

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Highly fluid basaltic lava is able to cool smoothly and form a ropy texture called pahoehoe, while slower flowing, more viscous basaltic lava tends to cool with a rough, blocky texture known as aa.

Highly Fluid Basaltic Lava May Cool with a Smooth,ropy Surface