Question

Why would pahoehoe and a'a lava erupt from shield volcanos, but not from composite volcanoes?

Answer 1

Answer:

Shield volcanoes are built by many layers over time and the layers are usually of very similar composition. The low viscosity also means that shield eruptions are non-explosive. There are two types of lava flows, pahoehoe which is a ropy type of lava that flows easily (low viscosity).