Asked by Karina Herrera on Jul 16, 2024
Verified
A porphyritic igneous texture indicates that:
A) there was water in the magma
B) the rock cooled slowly and then quickly
C) the rock broke apart as it flowed
D) the rock cooled slowly
E) the ash and pumice were hot and became compacted
Porphyritic Texture
A texture in igneous rocks characterized by larger crystals, known as phenocrysts, embedded in a finer-grained matrix.
- Differentiate and catalog various igneous rock textures, including welded, glassy, vesicular, and porphyritic textures.
- Outline the steps involved in the cooling and solidification process of magma or lava, and describe their consequences on the texture of the rock produced.
Verified Answer
ZA
zalla AhmadiJul 19, 2024
Final Answer :
B
Explanation :
A porphyritic texture in igneous rocks indicates a two-stage cooling process where the rock cooled slowly at first, allowing large crystals to form, and then cooled quickly, resulting in a finer-grained matrix.
Learning Objectives
- Differentiate and catalog various igneous rock textures, including welded, glassy, vesicular, and porphyritic textures.
- Outline the steps involved in the cooling and solidification process of magma or lava, and describe their consequences on the texture of the rock produced.