VOLCANOES
Volcanoes are usually in the form of
conical mountains. The molten magma and gases escape through a vertical tunnel
called a vent. Once the magma
reaches the Earth’s surface, it is called lava.
The bursting of the magma from the vent is called an eruption. As the lava flows, it cools down and hardens to form
solid rock. When it hardens around a vent in the shape of a hollow bowl, it
forms crater.
Depending on the nature
of their eruption, volcanoes can be either extinct,
dormant or active.
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