Which one of the following shows the correct order (from left to right)of decreasing magma viscosity? (remember that viscosity is resistance to flow, so you should pick the answer that has the most viscous lava type on the left, and the least viscous (most runny)on the right.

Question

Quizplus · Accepted Answer

Rhyolite has the highest silica content and therefore the highest viscosity, followed by andesite and then basalt with the lowest silica content and viscosity. So, the correct order from left to right for decreasing magma viscosity is rhyolite, andesite, and basalt, which is represented by answer choice A.

Which One of the Following Shows the Correct Order (From