Plateaus
&
volcanoes
Created by Saranya, Sanya, Sharanya, Shrey and
Shreyashi
A volcano is an opening, or rupture, in a planet's surface or crust,
which allows hot magma, volcanic ash and gases to escape
from below the surface. Basically there are three types of
volcanoes : Active volcanoes
 Dormant volcanoes
 Extinct volcanoes
An erupting volcano
Even though there are at least three main types of volcanoes
they have similar interioructures.
• The Crater sometimes called the vent is the mouth of the
volcano where the lava and gases escape during an
eruption.
• The Volcanic Neck or Shaft is the main conduit where
magma rises through the volcano form the lower storage
chamber.
• The Sill is where magma cuts between layers of preexisting rock in the volcano.
• A Dike is where magma cuts across layers of preexisting rock.
Volcanoes are found in three states - extinct,
dormant and active. An extinct volcano will never
erupt again. A dormant volcano has not erupted
in 2000 years. An active volcano has erupted
recently and is likely to erupt again.
Nevado del Ruiz, an active
volcano
Mt fujiyama, an dormant
volcano
Mt Kilimanjaro, an extinct
volcano
• The name "volcano" has its origin from the name
of Vulcan, a god of fire in Roman mythology.
• The volcanic rock pumice is the only rock that can
float in water. It is usually grey and full of bubbly
holes, which form when hot gases jet furiously out of
the rock as it cools
• Volcanoes can grow. As lava and ash accumulate, they
add layers and height to the volcanic surface. This is
one common way mountains are built