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Read the text and answer the following question.
The reason volcanoes are formed is because the temperature under the surface of the earth becomes hotter and hotter the deeper it gets. At a depth of about twenty miles, it is hot enough to melt most rocks. When rock melt, it expands and needs a lot more space. In other areas of the world mountains are being uplifted. The preasure is not so great under these nising mountain ranges and so a reservoir of melted rock known as magma may for underneath them.
This molten rock nises along cacks formed on the uplift. When the pressure in the reservoir becomes greater than the roof of rock over it, it erupts as a volcano. During the eruption, hor gaseous liquid, or solid material is actually blown out. The material piles up around the opening and a cone-shaped mound is founded. The coue is the result of a volcano
What is the depth of the earth like?
It is frozen.
We find piles of rock.
It is deeper and hotter.
The air pressure is low.
It is full of rocks.
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