Asked by Sarah Elizabeth on May 22, 2024
Verified
Which of the following rock types is NOT characteristic of volcanic domes?
A) glassy volcanic rocks that are unstable over time
B) vesicular basalt with very large holes from dangerous gas
C) volcanic breccia formed by fracturing of the outer part of the dome
D) mixtures of pieces of the dome and ash from dome collapse
Vesicular Basalt
A type of basalt that is porous due to gas bubbles (vesicles) trapped within the lava as it cools on the Earth's surface.
Volcanic Breccia
A type of rock consisting of angular fragments of volcanic material cemented together by finer-grained sediments or volcanic ash.
Volcanic Domes
Rounded, mound-shaped protrusions resulting from the slow extrusion of viscous lava from a volcano.
- Identify the distinctions among kinds of volcanic rocks and their methods of formation.
Verified Answer
AG
Angie GonzalesMay 28, 2024
Final Answer :
B
Explanation :
Volcanic domes are typically formed by viscous magma that does not flow easily, leading to the creation of steep-sided domes. Vesicular basalt, characterized by its large holes from gas release, is more indicative of fluid lava flows rather than the highly viscous magma associated with volcanic domes.
Learning Objectives
- Identify the distinctions among kinds of volcanic rocks and their methods of formation.