How is volcano formed?
Weather Wiz Kids weather information for kids
(Volcanoes are not associated with weather, but instead are natural
*What is a volcano?*
A volcano is a mountain that opens downward to a pool of molten rock below
the surface of the earth. When pressure builds up, eruptions occur. Gases
and rock shoot up through the opening and spill over or fill the air with
lava fragments. Eruptions can cause lateral blasts, lava flows, hot ash
flows, mudslides, avalanches, falling ash and floods. Volcano eruptions
have been known to knock down entire forests. An erupting volcano can
trigger tsunamis, flash floods, earthquakes, mudflows and rockfalls.
*Click Here* to learn more about volcanoes from USGS.
*How are volcanoes formed?*
Volcanoes are formed when magma from within the Earth's upper mantle works
its way to the surface. At the surface, it erupts to form lava flows and
ash deposits. Over time as the volcano continues to erupt, it will get
bigger and bigger.
*What are the different stages of volcanoes? *
Scientists have categorized volcanoes into three main categories: active,
dormant, and extinct. An active volcano is one which has recently erupted
and there is a possibility that it may erupt soon. A dormant volcano is one
which has not erupted in a long time but there is a possibility it can
erupt in the future. An extinct volcano is one which has erupted thousands
of years ago and theres no possibility of eruption.**
*Why do volcanoes erupt?*
The Earth's crust is made up of huge slabs called plates, which fit
together like a jigsaw puzzle. These plates sometimes move. The friction
causes earthquakes and volcanic eruptions near the edges of the plates. The
theory that explains this process is called
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