Question

2. Which of these is an igneous rock that is smooth and glassy?
a. Pumice
b. Obsidian
C. Granite
d. Shale​

Answer 1

Explanation:

Examples of aphanitic igneous rock include basalt, andesite and rhyolite. Glassy or vitreous textures occur during some volcanic eruptions when the lava is quenched so rapidly that crystallization cannot occur. The result is a natural amorphous glass with few or no crystals. Examples include obsidian.

Answer 2

Answer:

shale............. .