1. What happens immediately before a volcano erupts?
A) Magma collects in the mantle.
B) Lava hardens to form volcanic rock.
C) Expanding gases push magma through the pipe.
D) The temperature in the magma chamber decreases.
Is the answer C?
I think so.
no d
To determine the correct answer, let's analyze each option:
A) Magma collects in the mantle:
This option describes the process of magma formation, but it does not specifically relate to the immediate events leading up to a volcanic eruption.
B) Lava hardens to form volcanic rock:
This option refers to the solidification of lava, which occurs after a volcanic eruption. It does not pertain to the events immediately preceding an eruption.
C) Expanding gases push magma through the pipe:
This option describes one of the main triggers of a volcanic eruption. When magma accumulates beneath the Earth's surface, the increasing build-up of gases, particularly water vapor and carbon dioxide, causes pressure to rise. Eventually, this pressure becomes strong enough to push the magma through the volcano's conduit or pipe, leading to an eruption.
D) The temperature in the magma chamber decreases:
This option does not correspond to the immediate events before a volcanic eruption. Instead, it suggests the opposite – the cooling of the magma chamber.
Based on the above explanations, the correct answer for what happens immediately before a volcano erupts is C) Expanding gases push magma through the pipe.