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Chapter 15: Problem 63

What is the cause of the holes found in many volcanic rocks?

Short Answer

Expert verified
The holes in volcanic rocks are caused by gas bubbles trapped in the lava as it cools and solidifies.

Step by step solution

01

- Understand Volcanic Rocks

Volcanic rocks are formed from the cooling and solidification of magma or lava at or near the Earth鈥檚 surface. These rocks can have different textures and compositions.
02

- Identify Presence of Holes

Many volcanic rocks contain numerous holes or cavities. These holes are a prominent feature and need to be investigated for their cause.
03

- Discover the Cause of Holes

The holes, also known as vesicles, in volcanic rocks are created by gas bubbles trapped in the lava as it cools and solidifies. As lava comes to the surface, gases dissolved in the magma (such as water vapor, carbon dioxide, and sulfur dioxide) come out of solution and form bubbles. When the lava cools too quickly for the gas to escape, the gas bubbles become trapped in the solidified rock, forming holes.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Magma Solidification
When magma, which is molten rock beneath the Earth's surface, rises to the surface, it is called lava.
As lava cools, it undergoes a process known as solidification, turning from a liquid to a solid rock. This process occurs when the temperature drops enough to allow the minerals within the lava to crystallize.
The rate at which lava cools can significantly affect the texture and appearance of the final volcanic rock.
  • **Slow cooling:** Allows larger crystals to form, creating a textured rock, often termed as intrusive igneous rock.
  • **Fast cooling:** Results in fine-grained textures, typical of extrusive igneous rocks like basalt.
Solidification is essential for studying volcanic rocks because it can tell us a lot about the environment in which the rock was formed and its subsequent geological history.
Vesicles Formation
Vesicles are small, spherical cavities found within volcanic rocks.
They form when gas bubbles are trapped within the lava during the cooling process.
As magma beneath the Earth's surface contains dissolved gases, such as water vapor, carbon dioxide, and sulfur dioxide, pressure decreases as it ascends and erupts. These gases come out of solution, forming bubbles, similar to opening a carbonated drink and seeing bubbles rise.
When the lava cools rapidly, these gas bubbles do not have time to escape.
  • High gas content: Leads to more vesicles and larger cavities.
  • Low gas content: Fewer vesicles, giving the rock a denser appearance.
Vesicles are important because they can inform geologists about the volatile content of the volcanic eruption and the speed of the lava's cooling process.
Gas Bubbles in Lava
When lava erupts, it can contain various dissolved gases. These gases are primarily responsible for the formation of vesicles. After eruption, as lava is exposed to lower pressure at the Earth鈥檚 surface, these gases expand and escape, but not always entirely.
The primary gases involved include:
  • Water vapor (H2O): The most abundant gas, influencing the explosiveness of an eruption.
  • Carbon dioxide (CO2): Helps drive the eruption and contributes to vesicle formation.
  • Sulfur dioxide (SO2): Can lead to the formation of acids when combined with atmospheric moisture.
As lava cools, if it does so quickly, these gases get trapped within the rock structure, forming vesicles. Understanding the behavior of gas bubbles is crucial because their presence and density provide clues about the volcanic activity and the conditions under which the rock solidified.

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