Ash and lava fragments that cascade down the sides of a volcano eventually settle and lithify to form an extrusive igneous rock called ________.
A)basalt
B)andesite
C)hyaloclastite
D)tuff

Question

Quizplus · Accepted Answer

Tuff is an extrusive igneous rock that forms from the consolidation of various volcanic materials such as ash, lava fragments, and pumice. Basalt and andesite are also extrusive igneous rocks, but they form from cooled lava flows rather than pyroclastic materials. Hyaloclastite is a type of rock formed by the cooling and solidification of fragmented volcanic glass generated during explosive volcanic eruptions, but it is not a common product of volcanic activity.

Ash and Lava Fragments That Cascade Down the Sides of a Volcano