Download Cross section of a volcano - Newcastle School for Boys

Cross section of a volcano
Some new key words
volcanoes
-
Volcano
Vent
Secondary cone
Lava
Dormant
Eruption
Volcanic dust
-
Volcanic ash
Magma chamber
Volcanic gas
Cone
Crater
Active
Extinct
What is a volcano?
• A volcano is an opening in the Earths
crust known as a vent. Magma from
inside the earth is forced out and
erupts as lava, ash, gas, and dust.
When these materials are forced
through the vent is causes an eruption.
How do volcanoes form?
Volcano erupts
Volcano builds up
Volcano formed
Gas, ash,
dust
crater
Secondary
cone
Lava
Layers of
ash and
lava
con
e
Main
vent
Magma
chamber
Gas, ash,
dust
crate
r
Lava
Secondary
cone
Layers of
ash and
lava
Main
vent
Magma
chamber
Activities:
a) Complete activity 2
on p133 - clearly
and well labelled.
b) For each of the
following terms
write a definition
into your book
using page 132 and
the glossary:
volcano, mud flow,
pyroclastic flow,
volcanologist
c) Explain the
difference between
lava and magma.
Label this cross section of a volcano
Volcanic bombs,
ash, lava, gases
Magma chamber
Parasitic cone
Crater
Main vent
Cross section of a volcano
Crater
Volcanic
bombs, ash
and gases
Parasitic
cone
Main vent
Magma
chamber
Volcanic emissions
Volcanic emissions
Why do they happen?
A destructive plate boundary is found where a continental plate meets an
oceanic plate.
The oceanic plate descends under the continental plate because it is denser.
As the plate descends it starts to melt due to the friction caused by the
movement between the plates. This melted plate is now hot, liquid rock
(magma). The magma rises through the gaps in the continental plate. If it
reaches the surface, the liquid rock forms a volcano.
Destructive plate boundary
Constructive plate boundary
Volcano shapes
Why do volcanoes have different shapes?
Volcano shapes