What is the difference between an igneous rock with a glassy texture and a fine-texture? what causes this?

The major difference between an igneous rock with a glassy texture and the igneous rock with fine-texture is that the igneous rock with a glassy texture does not have the orderly arrangement of the atoms

while the igneous rock with a fine texture have an orderly arrangement of the atoms in the crystal

The cause of the fine texture igneous rock formation is the quick cooling of the lava on the Earth's surface

while igneous rock with a glassy texture  is formed of rapid cooling of lava precisely due to quenching in water.

Explanation:

The major difference between an igneous rock with a glassy texture and the igneous rock with fine-texture is that the igneous rock with a glassy texture does not have the orderly arrangement of the atoms

while the igneous rock with a fine texture have an orderly arrangement of the atoms in the crystal and the crystals formed are too small that it cannot be seen by unaided eyes.

The cause of the fine texture igneous rock formation is the quick cooling of the lava on the Earth's surface

while igneous rock with a glassy texture  is formed of rapid cooling of lava precisely due to quenching in water.