A VOLCANO IS:
• geological phenomenon on the Earth’s surface. It usually looks like a
hill or a mountain. How does it happen? There is magma in the
centre of the Earth. It erupts because of the pressure inside the
Earth. There are two shapes of volcanoes: conical and gradual. The
word volcano comes from the name of the god of war called
Volcano from Roman mythology. Volcanology studies volcanoes.
A VOLCANO HAS GOT:
• a main vent through which lava comes to the surface. It
sometimes has got side vents too. They are cracks that
appeared because of magma pressure. On the top of the
volcano, there is a crater where lava flows out.
MOST OF VOLCANOES ARE:
• below the sea surface. There were 1,511 active volcanoes in the last
10,000 years but each year, there are still from 50 to 60 active
• dangerous for people living nearby because of the lava flows, falling
volcanic ashes and poisonous gases that arise in the volcano crater.
BEFORE THE VOLCANIC ERUPTS:
• carbon acid is deposited in crater lakes, carbon dioxide comes
from the ground and for that reason trees dry and rocks blunt.
You can smell sulphur which comes from the ground too.
THE BIGGEST AND THE LAUDEST
• happened in 1883 in Indonesia. The Volcano is named Krakatau.
People who lived even 1,000 kilometres away could hear the
• it can be very dangerous when volcanoes erupt underneath the sea
surface because this can lead to a tsunami which means very big
waves that are dangerous for the people on the coast.