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1.3 Volcanism (part 1)
1.3: Volcanoes - part 3
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Aardrijkskunde
Middelbare school
havo, vwo
Leerjaar 2
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Lesson duration is:
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1.3: Volcanoes - part 3
Slide 1 - Slide
This lesson
Explanation 1.3
Videoclip
Working for yourself (test preparation)
Slide 2 - Slide
Learning goals
You know what a volcano is and what the consequences of volcanic eruptions can be
You know the different types of volcanoes
You can point out the regions with volcanic activity on a map showing the tectonic plates
Slide 3 - Slide
Where do volcanoes form?
Convergent
plate borders (colliding)
Divergent
plate borders (spreading)
Ring of fire
Slide 4 - Slide
How do volcanoes form?
Convergent movement (subduction zone) > oceanic plate and continental plate > stratovolcano
Divergent movement > oceanic plate and oceanic plate > shield volcano
Hotspots > shield volcano
Slide 5 - Slide
1: Subduction zone
(volcanoes on land)
A volcano is formed by a series of eruptions of lava and ash
Ocean floor is pushed into mantel
Rock melts, magma is formed
Heated substance lighter than surroundings
Heated substance wants to rise
Pressure too high: eruption
Magma becomes lava and leaves volcano via the crater
Slide 6 - Slide
Stratovolcano
Convergent movement
Oceanic plate and continental plate
Subduction zone
Slide 7 - Slide
Stratovolcano
Slide 8 - Slide
Stratovolcano
Explosive
Steep slopes
Subduction zone
Slide 9 - Slide
2: divergent movement (volcanoes in the ocean)
Two parts of ocean floor move apart
Crack in the Earth’s crust
Filled with hot rock (lava)
Lava comes into contact with water
Lava solidifies
A new piece of ocean floor is formed
Mid-ocean ridge
= sort of stretched out mountain range along the ocean floor
Slide 10 - Slide
Mid oceanic ridge
Divergent movement
Oceanic and oceanic plate
Volcanoes in the oceans can become volcanic islands
Slide 11 - Slide
Shield volcano
Effusive
(niet explosief)
Flat slopes (vlakke hellingen)
Divergent movement and hotspots
Slide 12 - Slide
How are volcanoes formed?
Bron: BuiteNLand HA1
Slide 13 - Slide
3: Hotspot
Burns through earth's crust and forms volcano
Earth's crust slides over hotspot, volcano "floats" onward
Shield volcano
Slide 14 - Slide
Slide 15 - Video
Slide 16 - Slide
Point out the regions with volcanic activity on the map
Slide 17 - Slide
How do volcanoes form?
Convergent movement > oceanic plate and continental plate > stratovolcano
Divergent movement > oceanic plate and oceanic plate > shield volcano
Hotspots > shield volcano
Slide 18 - Slide
This lesson
Explanation 1.3
Working for yourself (test preparation)
Slide 19 - Slide
Working for yourself
Make a summary
Worksheet
Oefentoets
Videoclips
Extra explanation
Preparation test: 1.1 and 1.2
Slide 20 - Slide
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