A finely crystalline or glassy igneous texture indicates that:

A) there was a lot of gas in the magma
B) the rock cooled quickly
C) the rock broke apart as it flowed
D) the rock cooled slowly
E) the ash and pumice were hot and became compacted

Finely Crystalline

Describes a texture of rocks or minerals with very small crystals that are often too small to be seen unaided, indicating rapid cooling or chemical precipitation.

Glassy Texture

A description of igneous rocks that cooled quickly from molten material, resulting in a non-crystalline or vitreous appearance.