If you found tuff deposits at an ________ igneous setting,you could conclude that the source magma had a ________ viscosity.
A)intrusive;high
B)intrusive;low
C)extrusive;high
D)extrusive;low

Question

Quizplus · Accepted Answer

Tuff deposits are formed from explosive volcanic eruptions, which are characteristic of extrusive igneous settings. High viscosity magma creates explosive eruptions, as the gas bubbles cannot escape and pressure builds up until the magma explodes. Therefore, the presence of tuff deposits suggests that the source magma had a high viscosity.

If You Found Tuff Deposits at an ________ Igneous Setting,you