High School

What is the origin of fragmental textures in rocks, and what do they imply about the type of volcanic activity?

A) Fragmental textures result from lava flows with minimal gas content.
B) Fragmental textures indicate rocks formed by sedimentary processes.
C) Fragmental textures develop when magma cools slowly at great depths.
D) Fragmental textures imply volcanic activity dominated by explosive, violent eruptions.

Answer :

Final answer:

The origin of fragmental textures in rocks is from explosive volcanic eruptions, indicating violent and explosive volcanic activity.

Explanation:

Fragmental textures in rocks originate from explosive volcanic eruptions, where solid fragments and ash are ejected. This implies a volcanic activity that is characterized by violent and explosive eruptions.

Therefore, the correct answer to your question is D) Fragmental textures imply volcanic activity dominated by explosive, violent eruptions.

An example of a fragmental volcanic rock is tuff, which is composed of volcanic ash and sometimes contains glass and pumice fragments.

Another characteristic rock is pumice, known for its frothy texture with many gas bubbles.

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