Answer :
Final answer:
A texture known as glassy texture is formed when lava cools so rapidly that no crystals can form, resulting in volcanic glass such as obsidian. A vesicular texture is also possible, characterized by bubbles or holes from trapped gas bubbles.
Explanation:
When lava cools rapidly, not allowing time for crystals to arrange themselves, the resulting texture is referred to as glassy texture. This type of volcanic glass forms when the lava cools so quickly at the Earth's surface that no crystals have a chance to form.
Obsidian is a well-known example of this texture which resembles the conchoidal fracture found in quartz. Besides glassy texture, another texture that can form due to the trapping of gas bubbles during the rapid cooling of lava is called a vesicular texture. This texture contains bubbles or holes known as vesicles.
