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Volcanoes
Volcanoes are often cone-shaped, but they can take other
shapes too.
They are formed when molten, sticky rock called magma,
forces its way through a crack in the Earth’s crust.
The melted rock that spills out of the crater on the top of
the volcano is called lava. The lava destroys everything in
its path because it is very, very hot!
Where do
volcanoes
happen?
Most volcanoes
are formed on
land, but there are
some volcanoes
that are on the
ocean floor. Some
of these volcanoes
emerge from the
water because
they are very high.
Why does a volcano erupt?
A volcano erupts when magma and
gases find a way to escape, so they
burst to the surface through a vent.
An eruption can be quite gentle or
very violent.
Types of volcano
Volcanoes can be active, dormant or extinct.
• A volcano is active, or alive, when it erupts often.
• When a volcano is dormant, or sleeping, it has not
erupted for a long time – but it might in the future.
• A volcano is extinct, or dead, when it hasn’t erupted
for at least 100,000 years.
Eruption patterns
There are three different levels of
eruption:
1. If it easy for the gases to
escape, then the eruption is very
gentle. However, the lava is very
runny and can move very fast.
2. Gas builds up and lumps of rock (‘bombs’) and ash burst
out of the volcano. This makes the lava thick and sticky.
3. This is the fiercest eruption
of all because the gases and
magma become trapped
inside the volcano. This
causes a huge explosion,
which can be big enough to
remove the top of the whole
mountain!
Did you know?
Pumice stone, which comes from volcanoes, is very light
because it contains lot of tiny bubbles. If there are enough
bubbles, then pumice stone can float on water!
Mount Kilauea, in Hawaii, is the
most active volcano on Earth
because it has been erupting
since 1983!
The word, ‘volcano’ comes from the name Vulcan, who was
the Roman god of fire.
GLOSSARY
Bomb – a lump of rock thrown out in an eruption
Crater – a deep hollow at the top of a volcano
Crust – The top layer of the Earth
Eruption – the release of gases, magma and rock from a volcano
Lava – melted rock that flows down the volcano
Magma – melted rock inside the Earth
Molten – melted, liquid
Vent – a crack on the side of a volcano where magma can escape

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Volcanoes

  • 2. Volcanoes are often cone-shaped, but they can take other shapes too. They are formed when molten, sticky rock called magma, forces its way through a crack in the Earth’s crust. The melted rock that spills out of the crater on the top of the volcano is called lava. The lava destroys everything in its path because it is very, very hot!
  • 3. Where do volcanoes happen? Most volcanoes are formed on land, but there are some volcanoes that are on the ocean floor. Some of these volcanoes emerge from the water because they are very high. Why does a volcano erupt? A volcano erupts when magma and gases find a way to escape, so they burst to the surface through a vent. An eruption can be quite gentle or very violent.
  • 4. Types of volcano Volcanoes can be active, dormant or extinct. • A volcano is active, or alive, when it erupts often. • When a volcano is dormant, or sleeping, it has not erupted for a long time – but it might in the future. • A volcano is extinct, or dead, when it hasn’t erupted for at least 100,000 years.
  • 5. Eruption patterns There are three different levels of eruption: 1. If it easy for the gases to escape, then the eruption is very gentle. However, the lava is very runny and can move very fast. 2. Gas builds up and lumps of rock (‘bombs’) and ash burst out of the volcano. This makes the lava thick and sticky.
  • 6. 3. This is the fiercest eruption of all because the gases and magma become trapped inside the volcano. This causes a huge explosion, which can be big enough to remove the top of the whole mountain!
  • 7. Did you know? Pumice stone, which comes from volcanoes, is very light because it contains lot of tiny bubbles. If there are enough bubbles, then pumice stone can float on water! Mount Kilauea, in Hawaii, is the most active volcano on Earth because it has been erupting since 1983! The word, ‘volcano’ comes from the name Vulcan, who was the Roman god of fire.
  • 8. GLOSSARY Bomb – a lump of rock thrown out in an eruption Crater – a deep hollow at the top of a volcano Crust – The top layer of the Earth Eruption – the release of gases, magma and rock from a volcano Lava – melted rock that flows down the volcano Magma – melted rock inside the Earth Molten – melted, liquid Vent – a crack on the side of a volcano where magma can escape