Asked by Tyrin Davis on Jul 05, 2024
Verified
Which of the following is the best indicator that a volcano might be very dangerous?
A) gentle slopes that signify fast-flowing lavas
B) rock analyses that indicate a low content of silica
C) a volcano that contains andesite and welded tuffs
D) ages that indicate the volcano last erupted 10 million years ago
Welded Tuffs
Volcanic deposits formed from hot ash flows that solidify, with the particles welding together due to the heat.
Andesite
A volcanic rock of intermediate composition, typically found in volcanic arcs associated with subduction zones, characterized by a medium gray or brown color.
Silica Content
The proportion of silicon dioxide (SiO2) in a rock, mineral, or geological sample, influencing its physical properties and behavior.
- Understanding the hazards linked to various forms of volcanic eruptions and their characteristics.
Verified Answer
JA
Jadell AndrewsJul 06, 2024
Final Answer :
C
Explanation :
Andesite and welded tuffs are indicative of explosive eruptions, which can make a volcano particularly dangerous. These materials suggest the presence of viscous magma that can lead to powerful eruptions.
Learning Objectives
- Understanding the hazards linked to various forms of volcanic eruptions and their characteristics.