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How are volcanoes formed?
Lesson: How are volcanoes made? | Teacher Hub | Oak National Academy (thenational.academy)
Geography
In this lesson, you will need:
2
Exercise book or paper Pencil Brain
3
We are Geographers!
Geographers are types of scientists who
study the Earth; this includes the land (the
physical features) and the people who live
within it (the human features).
Types of volcanoes
Where are volcanoes found?
How are volcanoes formed?
4
How are volcanoes formed?
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Tectonic plates collide
Magma travels to the earth’s surface through a vent
Lava flows and ash deposits (gas, and rocks)
How are volcanoes formed?
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Tectonic plates move apart
Magma travels to the earth’s surface through a vent
Lava flows and cools to form rock
a.
when tectonic plates collide and one
plate is pushed beneath another.
b.
when tectonic plates remain still.
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Volcanoes are formed… (choose two options)
c.
when tectonic plates move away from
one another.
d.
when tectonic plates move around each
other.
a.
when tectonic plates collide and one
plate is pushed beneath another.
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Volcanoes are formed when… (choose two options)
c.
when tectonic plates move away from
one another.
Types of volcanoes
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Dormant Volcano: supposed to erupt again
Active Volcano: erupted in last 10,000 years
Types of volcanoes
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StratovolcanoShield Volcano
Types of volcanoes: Shield volcano
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Solid lava layers
Magma chamber
crater
side vent
vent
Types of volcanoes: Shield volcano
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solid lava layers, magma chamber, crater, side vent, vent
Types of volcanoes: Shield volcano
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low, short sides
crater
Types of volcanoes: stratovolcano
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Solid lava layers
Magma chamber
crater
side vent
vent
Types of volcanoes: Stratovolcano
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steep sides
crater
Types of volcanoes: stratovolcano
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solid lava layers, magma chamber, crater, side vent, vent
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Shield Volcano Stratovolcano
Cross section
Formation
Height
Style of eruption
Lava flows easily so a broad volcanic mountain is built up over time by repeated eruptions.
Lava does not flow as far. Many layers of hardened lava build up a steep volcano after repeated eruptions.
. Short with sides that are not steep. Tall with sides that are steep.
Liquid lava emitted from a central vent.
Thicker lava and explosive debris emitted from a small vent
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Shield Volcano Stratovolcano
Formation
Height
Style of eruption
Types of volcanoes
19
Shield Volcano Stratovolcano
Formation
Height
Style of eruption
Lava flows easily so a broad volcanic mountain is built up over time by repeated eruptions.
Lava does not flow as far. Many layers of hardened lava build up a steep volcano after repeated eruptions.
.
20
Shield Volcano Stratovolcano
Formation
Height
Style of eruption
Lava flows easily so a broad volcanic mountain is built up over time by repeated eruptions.
Lava does not flow as far. Many layers of hardened lava build up a steep volcano after repeated eruptions.
.
21
Shield Volcano Stratovolcano
Formation
Height
Style of eruption
Short with sides that are not steep. Tall with sides that are steep.
22
Shield Volcano Stratovolcano
Formation
Height
Style of eruption
Short with sides that are not steep. Tall with sides that are steep.
23
Shield Volcano Stratovolcano
Formation
Height
Style of eruption
Liquid lava emitted from a central vent.
Thicker lava and explosive debris emitted from a small vent.
24
Shield Volcano Stratovolcano
Formation
Height
Style of eruptionLiquid lava emitted from a central vent.
Thicker lava and explosive debris emitted from a small vent
Where do volcanoes occur and why?
25
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