QuestionApril 29, 2025

Which statement explains what happens as magma rises inside a volcano? Gases will contract in the chamber. The pressure of the gas will disappear. The magmatic pressure decreases. Magma moves to other chambers.

Which statement explains what happens as magma rises inside a volcano? Gases will contract in the chamber. The pressure of the gas will disappear. The magmatic pressure decreases. Magma moves to other chambers.
Which statement explains what happens as magma rises inside a volcano? Gases will contract in the chamber. The pressure of the gas will disappear. The magmatic pressure decreases. Magma moves to other chambers.

Solution
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Answer

None of the provided options fully explain what happens as magma rises inside a volcano. The correct explanation is that gases expand due to decreasing pressure. Explanation 1. Analyze the behavior of gases in magma as it rises As magma rises inside a volcano, the pressure decreases due to reduced overlying rock. This causes dissolved gases within the magma to expand rather than contract. Expansion occurs because gases are less compressed at lower pressures. 2. Evaluate the pressure dynamics of gases and magma The pressure of the gas does not disappear; instead, it increases locally as gases expand. Similarly, magmatic pressure does not decrease uniformly—it can increase locally due to gas expansion. Magma moving to other chambers is possible but not directly related to the question's focus on rising magma. 3. Identify the correct explanation The correct explanation is that gases expand as magma rises, which is not explicitly stated in the options. However, none of the provided options accurately describe this phenomenon. Among the given choices, "Gases will contract in the chamber" is incorrect because gases expand. "The pressure of the gas will disappear" is also incorrect because gas pressure remains significant. "The magmatic pressure decreases" is partially true but oversimplified. "Magma moves to other chambers" is unrelated to the primary process described.

Explanation

1. Analyze the behavior of gases in magma as it rises<br /> As magma rises inside a volcano, the pressure decreases due to reduced overlying rock. This causes dissolved gases within the magma to expand rather than contract. Expansion occurs because gases are less compressed at lower pressures.<br /><br />2. Evaluate the pressure dynamics of gases and magma<br /> The pressure of the gas does not disappear; instead, it increases locally as gases expand. Similarly, magmatic pressure does not decrease uniformly—it can increase locally due to gas expansion. Magma moving to other chambers is possible but not directly related to the question's focus on rising magma.<br /><br />3. Identify the correct explanation<br /> The correct explanation is that gases expand as magma rises, which is not explicitly stated in the options. However, none of the provided options accurately describe this phenomenon. Among the given choices, "Gases will contract in the chamber" is incorrect because gases expand. "The pressure of the gas will disappear" is also incorrect because gas pressure remains significant. "The magmatic pressure decreases" is partially true but oversimplified. "Magma moves to other chambers" is unrelated to the primary process described.
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